feat(M01-A): 建立后端API基础骨架

scripts/dev/windows/check-backend.ps1

@@ -0,0 +1,26 @@
+$ErrorActionPreference = "Stop"
+
+$requiredFiles = @(
+  "backend/package.json",
+  "backend/tsconfig.json",
+  "backend/.env.example",
+  "backend/src/app.ts",
+  "backend/src/config.ts",
+  "backend/src/routes/health.ts",
+  "backend/src/server.ts",
+  "backend/tests/backend-contract.test.mjs",
+  "deploy/pm2/ecosystem.config.cjs"
+)
+
+foreach ($path in $requiredFiles) {
+  if (-not (Test-Path $path)) {
+    throw "Required backend file missing: $path"
+  }
+}
+
+& npm --prefix backend test
+if ($LASTEXITCODE -ne 0) {
+  throw "backend contract test failed"
+}
+
+Write-Host "PASS: backend M01-A skeleton check passed."