feat(M02-A): 建立多小程序租户配置模型

backend/package.json

@@ -17,7 +17,7 @@
     "db:migrate:verify": "npm run build && node dist/db/migrate-cli.js verify",
     "db:migrate:down": "npm run build && node dist/db/migrate-cli.js down",
     "test:mysql:migration": "npm run build && node tests/mysql-migration-roundtrip.test.mjs",
-    "test": "npm run build && node tests/backend-contract.test.mjs && node tests/migration-contract.test.mjs && node tests/mysql-pool-contract.test.mjs && node tests/migration-runner.test.mjs && node tests/legacy-money.test.mjs && node tests/legacy-read-repository.test.mjs && node tests/task-repository.test.mjs"
+    "test": "npm run build && node tests/backend-contract.test.mjs && node tests/migration-contract.test.mjs && node tests/mysql-pool-contract.test.mjs && node tests/migration-runner.test.mjs && node tests/legacy-money.test.mjs && node tests/legacy-read-repository.test.mjs && node tests/task-repository.test.mjs && node tests/platform-config-repository.test.mjs"
   },
   "dependencies": {
     "@fastify/cors": "^11.2.0",

backend/src/app.ts

@@ -4,9 +4,14 @@ import rateLimit from '@fastify/rate-limit';
 import Fastify, { type FastifyInstance } from 'fastify';
 import { loadConfig, type AppConfig } from './config.js';
 import { registerHealthRoutes } from './routes/health.js';
+import {
+  registerPlatformBootstrapRoutes,
+  type PlatformConfigResolver
+} from './routes/platform-bootstrap.js';
 
 export interface BuildAppOptions {
   config?: AppConfig;
+  platformConfigRepository?: PlatformConfigResolver;
 }
 
 declare module 'fastify' {
@@ -49,6 +54,9 @@ export async function buildApp(options: BuildAppOptions = {}): Promise<FastifyIn
   });
 
   await registerHealthRoutes(app, config);
+  if (options.platformConfigRepository) {
+    await registerPlatformBootstrapRoutes(app, options.platformConfigRepository);
+  }
 
   return app;
 }

backend/src/db/migration-runner.ts

@@ -22,13 +22,16 @@ const repoRoot = resolve(dirname(fileURLToPath(import.meta.url)), '../../..');
 const migrationFiles: Record<MigrationDirection, readonly string[]> = {
   up: [
     'database/migrations/2026061601_m01b_core_schema.up.sql',
-    'database/migrations/2026061802_m01c_async_tasks.up.sql'
+    'database/migrations/2026061802_m01c_async_tasks.up.sql',
+    'database/migrations/2026061803_m02a_tenant_apps.up.sql'
   ],
   verify: [
     'database/migrations/2026061601_m01b_core_schema.verify.sql',
-    'database/migrations/2026061802_m01c_async_tasks.verify.sql'
+    'database/migrations/2026061802_m01c_async_tasks.verify.sql',
+    'database/migrations/2026061803_m02a_tenant_apps.verify.sql'
   ],
   down: [
+    'database/migrations/2026061803_m02a_tenant_apps.down.sql',
     'database/migrations/2026061802_m01c_async_tasks.down.sql',
     'database/migrations/2026061601_m01b_core_schema.down.sql'
   ]
@@ -146,7 +149,7 @@ export async function executeMigrationPlan(
   for (const [index, statement] of plan.statements.entries()) {
     const [result] = await pool.query(statement);
     if (plan.direction === 'verify') {
-      const minimumRows = [10, 26, 1, 2, 5, 1][index] ?? 1;
+      const minimumRows = [10, 26, 1, 2, 5, 1, 3, 5, 1][index] ?? 1;
       if (!Array.isArray(result) || result.length < minimumRows) {
         throw new Error(
           `Migration verification statement ${index + 1} returned fewer than ${minimumRows} rows.`

backend/src/routes/platform-bootstrap.ts

@@ -0,0 +1,55 @@
+import type { FastifyInstance } from 'fastify';
+import { z } from 'zod';
+import {
+  AmbiguousAppTenantError,
+  type PlatformBootstrap
+} from '../tenancy/platform-config-repository.js';
+
+const headerSchema = z.object({
+  'x-wechat-appid': z.string().trim().min(6).max(64),
+  'tenant-id': z.string().regex(/^[1-9]\d{0,19}$/).optional()
+});
+
+export interface PlatformConfigResolver {
+  resolveBootstrap(appId: string, tenantId?: string): Promise<PlatformBootstrap | null>;
+}
+
+export async function registerPlatformBootstrapRoutes(
+  app: FastifyInstance,
+  repository: PlatformConfigResolver
+): Promise<void> {
+  app.get('/app-api/bootstrap', async (request, reply) => {
+    const parsed = headerSchema.safeParse(request.headers);
+    if (!parsed.success) {
+      return reply.status(400).send({
+        code: 'INVALID_APP_CONTEXT',
+        message: 'x-wechat-appid is required and tenant-id must be a positive integer.',
+        traceId: request.traceId
+      });
+    }
+
+    try {
+      const bootstrap = await repository.resolveBootstrap(
+        parsed.data['x-wechat-appid'],
+        parsed.data['tenant-id']
+      );
+      if (!bootstrap) {
+        return reply.status(404).send({
+          code: 'APP_TENANT_NOT_FOUND',
+          message: 'The application and tenant binding is not active.',
+          traceId: request.traceId
+        });
+      }
+      return { code: 0, data: bootstrap, traceId: request.traceId };
+    } catch (error) {
+      if (error instanceof AmbiguousAppTenantError) {
+        return reply.status(409).send({
+          code: 'TENANT_SELECTION_REQUIRED',
+          message: error.message,
+          traceId: request.traceId
+        });
+      }
+      throw error;
+    }
+  });
+}

backend/src/server.ts

@@ -1,8 +1,17 @@
 import { buildApp } from './app.js';
 import { loadConfig } from './config.js';
+import { closeMySqlPool, createMySqlPool } from './db/mysql.js';
+import { PlatformConfigRepository } from './tenancy/platform-config-repository.js';
 
 const config = loadConfig();
-const app = await buildApp({ config });
+const pool = createMySqlPool(config);
+const app = await buildApp({
+  config,
+  platformConfigRepository: new PlatformConfigRepository(pool)
+});
+app.addHook('onClose', async () => {
+  await closeMySqlPool(pool);
+});
 
 try {
   await app.listen({ host: config.host, port: config.port });

backend/src/tenancy/platform-config-repository.ts

@@ -0,0 +1,107 @@
+import type { RowDataPacket } from 'mysql2/promise';
+import type { MySqlPool } from '../db/mysql.js';
+
+export interface PlatformBootstrap {
+  appId: string;
+  tenantId: string;
+  tenantCode: string;
+  tenantName: string;
+  brand: {
+    name: string;
+    logoUrl: string;
+    themeColor: string;
+    servicePhone: string;
+    franchisePhone: string;
+    shareTitle: string;
+    shareImageUrl: string;
+  };
+  defaultStoreId: string | null;
+}
+
+interface PlatformBootstrapRow extends RowDataPacket {
+  appId: string;
+  tenantId: string;
+  tenantCode: string;
+  tenantName: string;
+  brandName: string;
+  logoUrl: string;
+  themeColor: string;
+  servicePhone: string;
+  franchisePhone: string;
+  shareTitle: string;
+  shareImageUrl: string;
+  defaultStoreId: string | null;
+}
+
+export class AmbiguousAppTenantError extends Error {
+  constructor(appId: string) {
+    super(`Application ${appId} is bound to multiple tenants; tenant-id is required.`);
+    this.name = 'AmbiguousAppTenantError';
+  }
+}
+
+export class PlatformConfigRepository {
+  constructor(private readonly pool: Pick<MySqlPool, 'execute'>) {}
+
+  async resolveBootstrap(appId: string, tenantId?: string): Promise<PlatformBootstrap | null> {
+    const tenantFilter = tenantId ? 'AND ta.tenant_id = ?' : '';
+    const params = tenantId ? [appId, tenantId] : [appId];
+    const [rows] = await this.pool.execute<PlatformBootstrapRow[]>(
+      `SELECT pa.appid AS appId,
+              ta.tenant_id AS tenantId,
+              t.code AS tenantCode,
+              t.name AS tenantName,
+              tc.brand_name AS brandName,
+              tc.logo_url AS logoUrl,
+              tc.theme_color AS themeColor,
+              tc.service_phone AS servicePhone,
+              tc.franchise_phone AS franchisePhone,
+              tc.share_title AS shareTitle,
+              tc.share_image_url AS shareImageUrl,
+              tc.default_store_id AS defaultStoreId
+       FROM qipai_platform_apps pa
+       INNER JOIN qipai_tenant_apps ta
+         ON ta.platform_app_id = pa.id
+        AND ta.status = 'ACTIVE'
+        AND ta.deleted_at IS NULL
+       INNER JOIN qipai_tenants t
+         ON t.id = ta.tenant_id
+        AND t.status = 'ACTIVE'
+        AND t.deleted_at IS NULL
+       INNER JOIN qipai_tenant_configs tc
+         ON tc.platform_app_id = pa.id
+        AND tc.tenant_id = ta.tenant_id
+        AND tc.deleted_at IS NULL
+       WHERE pa.appid = ?
+         AND pa.status = 'ACTIVE'
+         AND pa.deleted_at IS NULL
+         ${tenantFilter}
+       ORDER BY ta.is_default DESC, ta.tenant_id ASC
+       LIMIT 2`,
+      params
+    );
+
+    if (!tenantId && rows.length > 1) {
+      throw new AmbiguousAppTenantError(appId);
+    }
+    const row = rows[0];
+    if (!row) return null;
+
+    return {
+      appId: row.appId,
+      tenantId: String(row.tenantId),
+      tenantCode: row.tenantCode,
+      tenantName: row.tenantName,
+      brand: {
+        name: row.brandName,
+        logoUrl: row.logoUrl,
+        themeColor: row.themeColor,
+        servicePhone: row.servicePhone,
+        franchisePhone: row.franchisePhone,
+        shareTitle: row.shareTitle,
+        shareImageUrl: row.shareImageUrl
+      },
+      defaultStoreId: row.defaultStoreId === null ? null : String(row.defaultStoreId)
+    };
+  }
+}

backend/tests/migration-contract.test.mjs

@@ -15,6 +15,9 @@ const legacyFixtureSql = read('database/fixtures/2026061801_m01b_legacy_schema.s
 const asyncUpSql = read('database/migrations/2026061802_m01c_async_tasks.up.sql');
 const asyncDownSql = read('database/migrations/2026061802_m01c_async_tasks.down.sql');
 const asyncVerifySql = read('database/migrations/2026061802_m01c_async_tasks.verify.sql');
+const tenantAppsUpSql = read('database/migrations/2026061803_m02a_tenant_apps.up.sql');
+const tenantAppsDownSql = read('database/migrations/2026061803_m02a_tenant_apps.down.sql');
+const tenantAppsVerifySql = read('database/migrations/2026061803_m02a_tenant_apps.verify.sql');
 
 const coreTables = [
   'qipai_schema_migrations',
@@ -86,4 +89,14 @@ assert.match(asyncUpSql, /UNIQUE KEY uq_qipai_async_tasks_idempotency/);
 assert.match(asyncUpSql, /lease_expires_at DATETIME\(3\)/);
 assert.match(asyncUpSql, /COMPENSATION_REQUIRED|status VARCHAR/);
 
-console.log('PASS: M01-B/M01-C migration contracts are present.');
+for (const table of ['qipai_platform_apps', 'qipai_tenant_apps', 'qipai_tenant_configs']) {
+  assert.match(tenantAppsUpSql, new RegExp(`CREATE TABLE IF NOT EXISTS ${table}\\b`));
+  assert.match(tenantAppsDownSql, new RegExp(`DROP TABLE IF EXISTS ${table}\\b`));
+  assert.match(tenantAppsVerifySql, new RegExp(`'${table}'`));
+}
+assert.match(tenantAppsUpSql, /UNIQUE KEY uq_qipai_tenant_apps_tenant_app \(tenant_id, platform_app_id\)/);
+assert.match(tenantAppsUpSql, /UNIQUE KEY uq_qipai_tenant_configs_tenant_app \(tenant_id, platform_app_id\)/);
+assert.match(tenantAppsUpSql, /brand_name VARCHAR/);
+assert.match(tenantAppsUpSql, /theme_color VARCHAR/);
+
+console.log('PASS: M01-B through M02-A migration contracts are present.');

backend/tests/migration-runner.test.mjs

@@ -13,7 +13,8 @@ assert.deepEqual(
 const plan = await loadMigrationPlan('up');
 assert.equal(plan.direction, 'up');
 assert.match(plan.file, /2026061601_m01b_core_schema\.up\.sql/);
-assert.match(plan.file, /2026061802_m01c_async_tasks\.up\.sql$/);
+assert.match(plan.file, /2026061802_m01c_async_tasks\.up\.sql/);
+assert.match(plan.file, /2026061803_m02a_tenant_apps\.up\.sql$/);
 assert.match(plan.checksum, /^[a-f0-9]{64}$/);
 assert.ok(plan.statements.length >= 11);
 

backend/tests/mysql-migration-roundtrip.test.mjs

@@ -6,6 +6,10 @@ import { loadConfig } from '../dist/config.js';
 import { closeMySqlPool, createMySqlPool } from '../dist/db/mysql.js';
 import { LegacyReadRepository } from '../dist/db/legacy-read-repository.js';
 import { TaskRepository } from '../dist/tasks/task-repository.js';
+import {
+  AmbiguousAppTenantError,
+  PlatformConfigRepository
+} from '../dist/tenancy/platform-config-repository.js';
 import {
   executeMigrationPlan,
   loadMigrationPlan,
@@ -21,9 +25,12 @@ const expectedTables = [
   'qipai_orders',
   'qipai_outbox_events',
   'qipai_payments',
+  'qipai_platform_apps',
   'qipai_rooms',
   'qipai_schema_migrations',
   'qipai_stores',
+  'qipai_tenant_apps',
+  'qipai_tenant_configs',
   'qipai_tenants'
 ];
 const repoRoot = resolve(dirname(fileURLToPath(import.meta.url)), '../..');
@@ -45,9 +52,9 @@ async function readMigrationVersions(pool) {
   const [rows] = await pool.query(
     `SELECT version, name
      FROM qipai_schema_migrations
-     WHERE version IN (?, ?)
+     WHERE version IN (?, ?, ?)
      ORDER BY version`,
-    ['2026061601', '2026061802']
+    ['2026061601', '2026061802', '2026061803']
   );
   return rows;
 }
@@ -120,6 +127,48 @@ async function assertTaskDurability(pool) {
   assert.deepEqual(rows, [{ status: 'SUCCEEDED', attempts: 1 }]);
 }
 
+async function assertPlatformTenantIsolation(pool) {
+  const [tenantResult] = await pool.query(
+    `INSERT INTO qipai_tenants (code, name)
+     VALUES ('M02A-A', 'M02A tenant A'), ('M02A-B', 'M02A tenant B')`
+  );
+  const firstTenantId = Number(tenantResult.insertId);
+  const secondTenantId = firstTenantId + 1;
+  const [appResult] = await pool.query(
+    `INSERT INTO qipai_platform_apps (appid, name)
+     VALUES ('wx-m02a-shared', 'M02A shared app')`
+  );
+  const platformAppId = Number(appResult.insertId);
+
+  await pool.query(
+    `INSERT INTO qipai_tenant_apps
+       (tenant_id, platform_app_id, is_default)
+     VALUES (?, ?, 1), (?, ?, 0)`,
+    [firstTenantId, platformAppId, secondTenantId, platformAppId]
+  );
+  await pool.query(
+    `INSERT INTO qipai_tenant_configs
+       (tenant_id, platform_app_id, brand_name, theme_color)
+     VALUES (?, ?, 'Tenant A Brand', '#111111'),
+            (?, ?, 'Tenant B Brand', '#222222')`,
+    [firstTenantId, platformAppId, secondTenantId, platformAppId]
+  );
+
+  const repository = new PlatformConfigRepository(pool);
+  const tenantA = await repository.resolveBootstrap('wx-m02a-shared', String(firstTenantId));
+  const tenantB = await repository.resolveBootstrap('wx-m02a-shared', String(secondTenantId));
+  assert.equal(tenantA?.brand.name, 'Tenant A Brand');
+  assert.equal(tenantB?.brand.name, 'Tenant B Brand');
+  assert.equal(
+    await repository.resolveBootstrap('wx-m02a-shared', String(secondTenantId + 999)),
+    null
+  );
+  await assert.rejects(
+    () => repository.resolveBootstrap('wx-m02a-shared'),
+    AmbiguousAppTenantError
+  );
+}
+
 const config = loadConfig();
 assert.equal(config.mysql.passwordConfigured, true, 'Live migration test requires a temporary password.');
 assert.match(
@@ -145,11 +194,13 @@ try {
   assert.deepEqual(await readCoreTables(pool), expectedTables);
   assert.deepEqual(await readMigrationVersions(pool), [
     { version: '2026061601', name: 'm01b_core_schema' },
-    { version: '2026061802', name: 'm01c_async_tasks' }
+    { version: '2026061802', name: 'm01c_async_tasks' },
+    { version: '2026061803', name: 'm02a_tenant_apps' }
   ]);
   await assertTaskDurability(pool);
+  await assertPlatformTenantIsolation(pool);
   await assertLegacyCompatibility(pool);
-  console.log('PASS: first up, verify and durable task restart check completed.');
+  console.log('PASS: first up, verify, durable task and tenant isolation checks completed.');
 
   await executeMigrationPlan(pool, plans.down);
   assert.deepEqual(await readCoreTables(pool), []);
@@ -161,7 +212,8 @@ try {
   assert.deepEqual(await readCoreTables(pool), expectedTables);
   assert.deepEqual(await readMigrationVersions(pool), [
     { version: '2026061601', name: 'm01b_core_schema' },
-    { version: '2026061802', name: 'm01c_async_tasks' }
+    { version: '2026061802', name: 'm01c_async_tasks' },
+    { version: '2026061803', name: 'm02a_tenant_apps' }
   ]);
   await assertLegacyCompatibility(pool);
   console.log('PASS: second up and verify restored the schema.');
@@ -187,7 +239,9 @@ try {
       'orders',
       'devices',
       'tenant isolation',
-      'decimal cents'
+      'decimal cents',
+      'app-to-tenant binding',
+      'cross-tenant bootstrap rejection'
     ]
   }, null, 2));
 } finally {

backend/tests/platform-config-repository.test.mjs

@@ -0,0 +1,88 @@
+import assert from 'node:assert/strict';
+import { buildApp } from '../dist/app.js';
+import {
+  AmbiguousAppTenantError,
+  PlatformConfigRepository
+} from '../dist/tenancy/platform-config-repository.js';
+
+const calls = [];
+const repository = new PlatformConfigRepository({
+  async execute(sql, params) {
+    calls.push([sql, params]);
+    return [[{
+      appId: 'wx-test-app',
+      tenantId: 7,
+      tenantCode: 'tenant-seven',
+      tenantName: 'Tenant Seven',
+      brandName: 'Seven棋牌',
+      logoUrl: 'https://api.txyundm.cn/uploads/tenant-7/logo.png',
+      themeColor: '#1677ff',
+      servicePhone: '4000000000',
+      franchisePhone: '',
+      shareTitle: 'Seven棋牌',
+      shareImageUrl: '',
+      defaultStoreId: 9
+    }], []];
+  }
+});
+
+const bootstrap = await repository.resolveBootstrap('wx-test-app', '7');
+assert.equal(bootstrap.tenantId, '7');
+assert.equal(bootstrap.defaultStoreId, '9');
+assert.equal(bootstrap.brand.name, 'Seven棋牌');
+assert.match(calls[0][0], /tc\.tenant_id = ta\.tenant_id/);
+assert.match(calls[0][0], /AND ta\.tenant_id = \?/);
+assert.deepEqual(calls[0][1], ['wx-test-app', '7']);
+
+const ambiguousRepository = new PlatformConfigRepository({
+  async execute() {
+    return [[
+      { tenantId: 1 },
+      { tenantId: 2 }
+    ], []];
+  }
+});
+await assert.rejects(
+  () => ambiguousRepository.resolveBootstrap('wx-multi-app'),
+  AmbiguousAppTenantError
+);
+
+const app = await buildApp({
+  platformConfigRepository: {
+    async resolveBootstrap(appId, tenantId) {
+      assert.equal(appId, 'wx-test-app');
+      assert.equal(tenantId, '7');
+      return bootstrap;
+    }
+  }
+});
+const response = await app.inject({
+  method: 'GET',
+  url: '/app-api/bootstrap',
+  headers: {
+    'x-wechat-appid': 'wx-test-app',
+    'tenant-id': '7',
+    'x-trace-id': 'm02a-test'
+  }
+});
+assert.equal(response.statusCode, 200);
+assert.equal(response.json().data.tenantId, '7');
+assert.equal(response.headers['x-trace-id'], 'm02a-test');
+await app.close();
+
+const missingContextApp = await buildApp({
+  platformConfigRepository: {
+    async resolveBootstrap() {
+      throw new Error('must not be called');
+    }
+  }
+});
+const invalidResponse = await missingContextApp.inject({
+  method: 'GET',
+  url: '/app-api/bootstrap'
+});
+assert.equal(invalidResponse.statusCode, 400);
+assert.equal(invalidResponse.json().code, 'INVALID_APP_CONTEXT');
+await missingContextApp.close();
+
+console.log('PASS: M02-A app and tenant bootstrap enforces explicit bindings.');

database/migrations/2026061803_m02a_tenant_apps.down.sql

@@ -0,0 +1,6 @@
+-- Roll back the M02-A multi-application and tenant configuration model.
+
+DELETE FROM qipai_schema_migrations WHERE version = '2026061803';
+DROP TABLE IF EXISTS qipai_tenant_configs;
+DROP TABLE IF EXISTS qipai_tenant_apps;
+DROP TABLE IF EXISTS qipai_platform_apps;

database/migrations/2026061803_m02a_tenant_apps.up.sql

@@ -0,0 +1,60 @@
+-- M02-A multi-application and tenant configuration model.
+
+CREATE TABLE IF NOT EXISTS qipai_platform_apps (
+  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  appid VARCHAR(64) NOT NULL,
+  name VARCHAR(128) NOT NULL,
+  status VARCHAR(32) NOT NULL DEFAULT 'ACTIVE',
+  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
+  deleted_at DATETIME(3) NULL,
+  UNIQUE KEY uq_qipai_platform_apps_appid (appid),
+  KEY idx_qipai_platform_apps_status (status, deleted_at)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS qipai_tenant_apps (
+  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  tenant_id BIGINT UNSIGNED NOT NULL,
+  platform_app_id BIGINT UNSIGNED NOT NULL,
+  status VARCHAR(32) NOT NULL DEFAULT 'ACTIVE',
+  is_default TINYINT(1) NOT NULL DEFAULT 0,
+  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
+  deleted_at DATETIME(3) NULL,
+  CONSTRAINT fk_qipai_tenant_apps_tenant
+    FOREIGN KEY (tenant_id) REFERENCES qipai_tenants(id),
+  CONSTRAINT fk_qipai_tenant_apps_platform_app
+    FOREIGN KEY (platform_app_id) REFERENCES qipai_platform_apps(id),
+  UNIQUE KEY uq_qipai_tenant_apps_tenant_app (tenant_id, platform_app_id),
+  KEY idx_qipai_tenant_apps_app_tenant (platform_app_id, tenant_id, status, deleted_at),
+  KEY idx_qipai_tenant_apps_tenant_default (tenant_id, is_default, status, deleted_at)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS qipai_tenant_configs (
+  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  tenant_id BIGINT UNSIGNED NOT NULL,
+  platform_app_id BIGINT UNSIGNED NOT NULL,
+  brand_name VARCHAR(128) NOT NULL,
+  logo_url VARCHAR(512) NOT NULL DEFAULT '',
+  theme_color VARCHAR(16) NOT NULL DEFAULT '#1677ff',
+  service_phone VARCHAR(32) NOT NULL DEFAULT '',
+  franchise_phone VARCHAR(32) NOT NULL DEFAULT '',
+  share_title VARCHAR(128) NOT NULL DEFAULT '',
+  share_image_url VARCHAR(512) NOT NULL DEFAULT '',
+  default_store_id BIGINT UNSIGNED NULL,
+  extra_config JSON NULL,
+  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
+  deleted_at DATETIME(3) NULL,
+  CONSTRAINT fk_qipai_tenant_configs_tenant
+    FOREIGN KEY (tenant_id) REFERENCES qipai_tenants(id),
+  CONSTRAINT fk_qipai_tenant_configs_platform_app
+    FOREIGN KEY (platform_app_id) REFERENCES qipai_platform_apps(id),
+  CONSTRAINT fk_qipai_tenant_configs_default_store
+    FOREIGN KEY (default_store_id) REFERENCES qipai_stores(id),
+  UNIQUE KEY uq_qipai_tenant_configs_tenant_app (tenant_id, platform_app_id),
+  KEY idx_qipai_tenant_configs_app_tenant (platform_app_id, tenant_id, deleted_at)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+INSERT IGNORE INTO qipai_schema_migrations (version, name)
+VALUES ('2026061803', 'm02a_tenant_apps');

database/migrations/2026061803_m02a_tenant_apps.verify.sql

@@ -0,0 +1,34 @@
+-- Verify the M02-A multi-application and tenant configuration model.
+
+SELECT table_name
+FROM information_schema.tables
+WHERE table_schema = DATABASE()
+  AND table_name IN (
+    'qipai_platform_apps',
+    'qipai_tenant_apps',
+    'qipai_tenant_configs'
+  )
+ORDER BY table_name;
+
+SELECT table_name, index_name
+FROM information_schema.statistics
+WHERE table_schema = DATABASE()
+  AND (
+    (table_name = 'qipai_platform_apps' AND index_name = 'uq_qipai_platform_apps_appid')
+    OR
+    (table_name = 'qipai_tenant_apps' AND index_name IN (
+      'uq_qipai_tenant_apps_tenant_app',
+      'idx_qipai_tenant_apps_app_tenant'
+    ))
+    OR
+    (table_name = 'qipai_tenant_configs' AND index_name IN (
+      'uq_qipai_tenant_configs_tenant_app',
+      'idx_qipai_tenant_configs_app_tenant'
+    ))
+  )
+GROUP BY table_name, index_name
+ORDER BY table_name, index_name;
+
+SELECT version, name
+FROM qipai_schema_migrations
+WHERE version = '2026061803';

scripts/dev/windows/check-backend.ps1

@@ -15,6 +15,8 @@ $requiredFiles = @(
   "backend/src/tasks/outbox-repository.ts",
   "backend/src/tasks/worker.ts",
   "backend/src/routes/health.ts",
+  "backend/src/routes/platform-bootstrap.ts",
+  "backend/src/tenancy/platform-config-repository.ts",
   "backend/src/server.ts",
   "backend/tests/backend-contract.test.mjs",
   "backend/tests/migration-contract.test.mjs",
@@ -23,6 +25,7 @@ $requiredFiles = @(
   "backend/tests/mysql-migration-roundtrip.test.mjs",
   "backend/tests/legacy-read-repository.test.mjs",
   "backend/tests/task-repository.test.mjs",
+  "backend/tests/platform-config-repository.test.mjs",
   "scripts/dev/wsl/mysql-migration-roundtrip.sh",
   "database/migrations/2026061601_m01b_core_schema.up.sql",
   "database/migrations/2026061601_m01b_core_schema.down.sql",
@@ -30,6 +33,9 @@ $requiredFiles = @(
   "database/migrations/2026061802_m01c_async_tasks.up.sql",
   "database/migrations/2026061802_m01c_async_tasks.down.sql",
   "database/migrations/2026061802_m01c_async_tasks.verify.sql",
+  "database/migrations/2026061803_m02a_tenant_apps.up.sql",
+  "database/migrations/2026061803_m02a_tenant_apps.down.sql",
+  "database/migrations/2026061803_m02a_tenant_apps.verify.sql",
   "database/seeds/2026061601_m01b_minimal_seed.sql",
   "deploy/pm2/ecosystem.config.cjs"
 )

scripts/dev/wsl/mysql-migration-roundtrip.sh

@@ -93,6 +93,6 @@ export QIPAI_MYSQL_USER="${username}"
 export QIPAI_MYSQL_PASSWORD="${password}"
 export QIPAI_MYSQL_CONNECTION_LIMIT=2
 
-echo "INFO: MySQL ${mysql_version}; running M01-B/M01-C migration roundtrip in a temporary database."
+echo "INFO: MySQL ${mysql_version}; running M01-B through M02-A migration roundtrip in a temporary database."
 npm --prefix backend run test:mysql:migration
-echo "PASS: M01-B/M01-C live MySQL migration roundtrip completed."
+echo "PASS: M01-B through M02-A live MySQL migration roundtrip completed."