feat(Go_Updater): 添加全新 Go 语言实现的自动更新器

- 新增多个源文件和目录，包括 app.rc、assets、build 脚本等
- 实现了与 MirrorChyan API 交互的客户端逻辑
- 添加了版本检查、更新检测和下载 URL 生成等功能
- 嵌入了配置模板和资源文件系统
- 提供了完整的构建和发布流程

Go_Updater/build.ps1

@@ -0,0 +1,111 @@
+# Lightweight Updater Build Script (PowerShell)
+param(
+    [string]$Version = "1.0.0",
+    [string]$OutputName = "AUTO_MAA_Go_Updater.exe",
+    [switch]$Compress = $false
+)
+
+Write-Host "========================================" -ForegroundColor Cyan
+Write-Host "AUTO_MAA_Go_Updater Build Script" -ForegroundColor Cyan
+Write-Host "========================================" -ForegroundColor Cyan
+
+# Set build variables
+$BuildDir = "build"
+$DistDir = "dist"
+$BuildTime = (Get-Date).ToString("yyyy-MM-ddTHH:mm:ssZ")
+
+# Get git commit hash
+try {
+    $GitCommit = (git rev-parse --short HEAD 2>$null).Trim()
+    if (-not $GitCommit) { $GitCommit = "unknown" }
+} catch {
+    $GitCommit = "unknown"
+}
+
+Write-Host "Build Information:" -ForegroundColor Yellow
+Write-Host "- Version: $Version"
+Write-Host "- Build Time: $BuildTime"
+Write-Host "- Git Commit: $GitCommit"
+Write-Host "- Target: Windows 64-bit"
+Write-Host ""
+
+# Create build directories
+if (-not (Test-Path $BuildDir)) { New-Item -ItemType Directory -Path $BuildDir | Out-Null }
+if (-not (Test-Path $DistDir)) { New-Item -ItemType Directory -Path $DistDir | Out-Null }
+
+# Set environment variables
+$env:GOOS = "windows"
+$env:GOARCH = "amd64"
+$env:CGO_ENABLED = "1"
+
+# Set build flags
+$LdFlags = "-s -w -X lightweight-updater/version.Version=$Version -X lightweight-updater/version.BuildTime=$BuildTime -X lightweight-updater/version.GitCommit=$GitCommit"
+
+Write-Host "Building application..." -ForegroundColor Green
+
+# Ensure icon resource is compiled
+if (-not (Test-Path "app.syso")) {
+    Write-Host "Compiling icon resource..." -ForegroundColor Yellow
+    if (Get-Command rsrc -ErrorAction SilentlyContinue) {
+        rsrc -ico icon/AUTO_MAA_Go_Updater.ico -o app.syso
+        if ($LASTEXITCODE -ne 0) {
+            Write-Host "Warning: Failed to compile icon resource" -ForegroundColor Yellow
+        } else {
+            Write-Host "Icon resource compiled successfully" -ForegroundColor Green
+        }
+    } else {
+        Write-Host "Warning: rsrc not found. Install with: go install github.com/akavel/rsrc@latest" -ForegroundColor Yellow
+    }
+}
+
+# Build the application
+$BuildCommand = "go build -ldflags=`"$LdFlags`" -o $BuildDir\$OutputName ."
+Invoke-Expression $BuildCommand
+
+if ($LASTEXITCODE -ne 0) {
+    Write-Host "Build failed!" -ForegroundColor Red
+    exit 1
+}
+
+Write-Host "Build completed successfully!" -ForegroundColor Green
+
+# Get file information
+$OutputFile = Get-Item "$BuildDir\$OutputName"
+$FileSizeMB = [math]::Round($OutputFile.Length / 1MB, 2)
+
+Write-Host ""
+Write-Host "Build Results:" -ForegroundColor Yellow
+Write-Host "- Output: $($OutputFile.FullName)"
+Write-Host "- Size: $($OutputFile.Length) bytes (~$FileSizeMB MB)"
+
+# Check file size requirement
+if ($FileSizeMB -gt 10) {
+    Write-Host "WARNING: File size exceeds 10MB requirement!" -ForegroundColor Red
+} else {
+    Write-Host "File size meets requirements (<10MB)" -ForegroundColor Green
+}
+
+# Optional UPX compression
+if ($Compress) {
+    Write-Host ""
+    Write-Host "Compressing with UPX..." -ForegroundColor Yellow
+    
+    if (Get-Command upx -ErrorAction SilentlyContinue) {
+        upx --best "$BuildDir\$OutputName"
+        
+        $CompressedFile = Get-Item "$BuildDir\$OutputName"
+        $CompressedSizeMB = [math]::Round($CompressedFile.Length / 1MB, 2)
+        
+        Write-Host "- Compressed Size: $($CompressedFile.Length) bytes (~$CompressedSizeMB MB)" -ForegroundColor Green
+    } else {
+        Write-Host "UPX not found. Skipping compression." -ForegroundColor Yellow
+    }
+}
+
+# Copy to dist directory
+Copy-Item "$BuildDir\$OutputName" "$DistDir\$OutputName" -Force
+Write-Host "- Copied to: $DistDir\$OutputName"
+
+Write-Host ""
+Write-Host "Build script completed successfully!" -ForegroundColor Cyan
+Write-Host "========================================" -ForegroundColor Cyan