feat(M03-C): 完成地图选店与距离排序

database/migrations/2026061809_m03c_store_discovery.down.sql

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+DELETE FROM qipai_schema_migrations WHERE version = '2026061809';
+ALTER TABLE qipai_stores
+  DROP INDEX idx_qipai_stores_tenant_coordinates,
+  DROP INDEX idx_qipai_stores_tenant_city_status,
+  DROP COLUMN district,
+  DROP COLUMN city;

database/migrations/2026061809_m03c_store_discovery.up.sql

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+ALTER TABLE qipai_stores
+  ADD COLUMN city VARCHAR(64) NOT NULL DEFAULT '' AFTER address,
+  ADD COLUMN district VARCHAR(64) NOT NULL DEFAULT '' AFTER city,
+  ADD KEY idx_qipai_stores_tenant_city_status (tenant_id, city, business_status, deleted_at),
+  ADD KEY idx_qipai_stores_tenant_coordinates (tenant_id, latitude, longitude);
+
+INSERT IGNORE INTO qipai_schema_migrations (version, name)
+VALUES ('2026061809', 'm03c_store_discovery');

database/migrations/2026061809_m03c_store_discovery.verify.sql

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+SELECT column_name FROM information_schema.columns
+WHERE table_schema = DATABASE() AND table_name = 'qipai_stores'
+  AND column_name IN ('city', 'district')
+ORDER BY column_name;
+
+SELECT index_name FROM information_schema.statistics
+WHERE table_schema = DATABASE() AND table_name = 'qipai_stores'
+  AND index_name IN ('idx_qipai_stores_tenant_city_status', 'idx_qipai_stores_tenant_coordinates')
+GROUP BY index_name ORDER BY index_name;
+
+SELECT version, name FROM qipai_schema_migrations WHERE version = '2026061809';