feat(config): 统一加载 .env 并强化本地启动脚本

scripts/start-local.ps1

@@ -13,6 +13,39 @@ $dataDir = Join-Path $repoRoot ".local\project-workbench-debug"
 $goBuildCache = Join-Path $repoRoot ".local\cache\go-build"
 $goModuleCache = Join-Path $repoRoot ".local\cache\go-mod"
 
+# 从仓库根 .env 加载配置（KEY=VALUE，支持 # 注释与空行；不存在则跳过）。
+# 后端只读取环境变量，这里把 .env 注入进程环境，子进程（go/bun）自动继承。
+$envFile = Join-Path $repoRoot ".env"
+if (-not (Test-Path -LiteralPath $envFile)) {
+    # Windows 常见坑：在记事本等里新建文件常变成 .env.txt
+    $alt = Join-Path $repoRoot ".env.txt"
+    if (Test-Path -LiteralPath $alt) { $envFile = $alt }
+    else { Write-Host "未找到 $envFile，将使用内置默认值（SQLite）。如需 PostgreSQL 请先创建该文件。" -ForegroundColor Yellow }
+}
+if (Test-Path -LiteralPath $envFile) {
+    Write-Host "正在从 $envFile 加载配置..." -ForegroundColor Cyan
+    $loaded = @()
+    Get-Content -LiteralPath $envFile | ForEach-Object {
+        $line = $_.Trim()
+        if ($line -eq "" -or $line.StartsWith("#")) { return }
+        if ($line -match '^\s*export\s+') { $line = $line -replace '^\s*export\s+', '' }
+        if ($line -match '^\s*([^=]+)=(.*)$') {
+            $name = $matches[1].Trim()
+            $value = $matches[2].Trim()
+            if ($value.StartsWith('"') -and $value.EndsWith('"')) {
+                $value = $value.Substring(1, $value.Length - 2)
+            }
+            [Environment]::SetEnvironmentVariable($name, $value, [System.EnvironmentVariableTarget]::Process)
+            $loaded += $name
+        }
+    }
+    Write-Host "已加载变量：$($loaded -join ', ')" -ForegroundColor Cyan
+    if (-not $env:DATABASE_URL) { Write-Host "警告：DATABASE_URL 为空，后端将回退 SQLite（数据不会同步）。" -ForegroundColor Yellow }
+}
+# 本地绑定默认值：未显式配置时，后端只监听本机、数据落在本地调试目录
+if (-not $env:CANVAS_BACKEND_ADDR) { $env:CANVAS_BACKEND_ADDR = '127.0.0.1:7381' }
+if (-not $env:CANVAS_BACKEND_DATA_DIR) { $env:CANVAS_BACKEND_DATA_DIR = $dataDir }
+
 foreach ($commandName in @("go", "bun")) {
     if (-not (Get-Command $commandName -ErrorAction SilentlyContinue)) {
         throw "未找到 $commandName，请先安装项目要求的运行时。"
@@ -70,11 +103,9 @@ $dataDirLiteral = ConvertTo-PowerShellLiteral $dataDir
 $backendCommand = @"
 `$ErrorActionPreference = 'Stop'
 Set-Location -LiteralPath $backendDirLiteral
-`$env:CANVAS_BACKEND_ADDR = '127.0.0.1:7381'
-`$env:CANVAS_BACKEND_DATA_DIR = $dataDirLiteral
 `$env:GOCACHE = $(ConvertTo-PowerShellLiteral $goBuildCache)
 `$env:GOMODCACHE = $(ConvertTo-PowerShellLiteral $goModuleCache)
-Write-Host '影策后端：http://127.0.0.1:7381' -ForegroundColor Cyan
+Write-Host "影策后端：$($env:CANVAS_BACKEND_ADDR)" -ForegroundColor Cyan
 go run ./cmd/server
 "@
 
@@ -91,4 +122,4 @@ $webProcess = Start-Process -FilePath $powerShellPath -WindowStyle Normal -Worki
 
 Write-Host "已打开前后端开发窗口。" -ForegroundColor Green
 Write-Host "后端窗口 PID: $($backendProcess.Id)；前端窗口 PID: $($webProcess.Id)"
-Write-Host "访问 http://localhost:3000；分别在两个窗口按 Ctrl+C 停止服务。"
+Write-Host "访问 http://localhost:7380；分别在两个窗口按 Ctrl+C 停止服务。"