feat(backend): establish gin sqlite service skeleton

init.ps1

@@ -12,6 +12,7 @@ $sdkRoot = if ($env:ANDROID_SDK_ROOT) {
 }
 
 $gradle = Join-Path $PSScriptRoot "android-buyer\gradlew.bat"
+$backendRoot = Join-Path $PSScriptRoot "backend-api"
 $adb = Join-Path $sdkRoot "platform-tools\adb.exe"
 $apk = Join-Path $PSScriptRoot "android-buyer\app\build\outputs\apk\debug\app-debug.apk"
 
@@ -31,9 +32,26 @@ $javaVersion = (& java -version 2>&1) -join "`n"
 if ($javaVersion -notmatch 'version "17(?:\.|")') {
     throw "需要 JDK 17，当前 java -version 输出: $javaVersion"
 }
+if (-not (Test-Path -LiteralPath (Join-Path $backendRoot "go.mod"))) {
+    throw "缺少 Go 后端工程: $backendRoot"
+}
+if (-not (Get-Command go -ErrorAction SilentlyContinue)) {
+    throw "缺少 Go 1.23.0，go 不在 PATH 中。"
+}
+$goVersion = (& go version) -join "`n"
+if ($goVersion -notmatch '\bgo1\.23\.0\b') {
+    throw "需要 Go 1.23.0，当前 go version 输出: $goVersion"
+}
+if (-not (Get-Command gcc -ErrorAction SilentlyContinue)) {
+    throw "SQLite CGO 构建需要 GCC，gcc 不在 PATH 中。"
+}
 
 $env:ANDROID_HOME = $sdkRoot
 $env:ANDROID_SDK_ROOT = $sdkRoot
+$env:GOTOOLCHAIN = "local"
+if ((& go env CGO_ENABLED) -ne "1") {
+    throw "SQLite 构建需要 CGO_ENABLED=1。"
+}
 
 Write-Host "==> 验证 Android 工程"
 Push-Location (Join-Path $PSScriptRoot "android-buyer")
@@ -48,6 +66,34 @@ try {
 
 Write-Host "==> Debug APK: $apk"
 
+Write-Host "==> 验证 Go 后端"
+Push-Location $backendRoot
+try {
+    & go test ./...
+    if ($LASTEXITCODE -ne 0) {
+        throw "Go 后端测试失败，退出码: $LASTEXITCODE"
+    }
+    & go vet ./...
+    if ($LASTEXITCODE -ne 0) {
+        throw "Go 后端 vet 失败，退出码: $LASTEXITCODE"
+    }
+    $unformatted = @(& gofmt -l cmd internal migrations)
+    if ($LASTEXITCODE -ne 0 -or $unformatted.Count -ne 0) {
+        throw "Go 后端存在未格式化文件: $($unformatted -join ', ')"
+    }
+    New-Item -ItemType Directory -Force "bin" | Out-Null
+    & go build -o "bin/cmroubao-api.exe" ./cmd/api
+    if ($LASTEXITCODE -ne 0) {
+        throw "Go API 构建失败，退出码: $LASTEXITCODE"
+    }
+    & go build -o "bin/cmroubao-migrate.exe" ./cmd/migrate
+    if ($LASTEXITCODE -ne 0) {
+        throw "Go migration 构建失败，退出码: $LASTEXITCODE"
+    }
+} finally {
+    Pop-Location
+}
+
 if ($env:RUN_START_COMMAND -eq "1") {
     if (-not (Test-Path -LiteralPath $adb)) {
         throw "缺少 SDK Platform Tools: $adb"