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.bat

@@ -0,0 +1,99 @@
+@echo off
+setlocal enabledelayedexpansion
+
+echo ========================================
+echo AUTO_MAA_Go_Updater Build Script
+echo ========================================
+
+:: Set build variables
+set VERSION=1.0.0
+set OUTPUT_NAME=AUTO_MAA_Go_Updater.exe
+set BUILD_DIR=build
+set DIST_DIR=dist
+
+:: Get current timestamp
+for /f "tokens=2 delims==" %%a in ('wmic OS Get localdatetime /value') do set "dt=%%a"
+set "YY=%dt:~2,2%" & set "YYYY=%dt:~0,4%" & set "MM=%dt:~4,2%" & set "DD=%dt:~6,2%"
+set "HH=%dt:~8,2%" & set "Min=%dt:~10,2%" & set "Sec=%dt:~12,2%"
+set "BUILD_TIME=%YYYY%-%MM%-%DD%T%HH%:%Min%:%Sec%Z"
+
+:: Get git commit hash (if available)
+git rev-parse --short HEAD > temp_commit.txt 2>nul
+if exist temp_commit.txt (
+    set /p GIT_COMMIT=<temp_commit.txt
+    del temp_commit.txt
+) else (
+    set GIT_COMMIT=unknown
+)
+
+echo Build Information:
+echo - Version: %VERSION%
+echo - Build Time: %BUILD_TIME%
+echo - Git Commit: %GIT_COMMIT%
+echo - Target: Windows 64-bit
+echo.
+
+:: Create build directories
+if not exist %BUILD_DIR% mkdir %BUILD_DIR%
+if not exist %DIST_DIR% mkdir %DIST_DIR%
+
+:: Set build flags
+set LDFLAGS=-s -w -X lightweight-updater/version.Version=%VERSION% -X lightweight-updater/version.BuildTime=%BUILD_TIME% -X lightweight-updater/version.GitCommit=%GIT_COMMIT%
+
+echo Building application...
+
+:: Ensure icon resource is compiled
+if not exist app.syso (
+    echo Compiling icon resource...
+    where rsrc >nul 2>&1
+    if !ERRORLEVEL! equ 0 (
+        rsrc -ico icon\AUTO_MAA_Go_Updater.ico -o app.syso
+        if !ERRORLEVEL! equ 0 (
+            echo Icon resource compiled successfully
+        ) else (
+            echo Warning: Failed to compile icon resource
+        )
+    ) else (
+        echo Warning: rsrc not found. Install with: go install github.com/akavel/rsrc@latest
+    )
+)
+
+set GOOS=windows
+set GOARCH=amd64
+set CGO_ENABLED=1
+
+:: Build the application
+go build -ldflags="%LDFLAGS%" -o %BUILD_DIR%\%OUTPUT_NAME% .
+
+if %ERRORLEVEL% neq 0 (
+    echo Build failed!
+    exit /b 1
+)
+
+echo Build completed successfully!
+
+:: Get file size
+for %%A in (%BUILD_DIR%\%OUTPUT_NAME%) do set FILE_SIZE=%%~zA
+
+:: Convert bytes to MB
+set /a FILE_SIZE_MB=%FILE_SIZE%/1024/1024
+
+echo.
+echo Build Results:
+echo - Output: %BUILD_DIR%\%OUTPUT_NAME%
+echo - Size: %FILE_SIZE% bytes (~%FILE_SIZE_MB% MB)
+
+:: Check if file size is within requirements (<10MB)
+if %FILE_SIZE_MB% gtr 10 (
+    echo WARNING: File size exceeds 10MB requirement!
+) else (
+    echo File size meets requirements (^<10MB)
+)
+
+:: Copy to dist directory
+copy %BUILD_DIR%\%OUTPUT_NAME% %DIST_DIR%\%OUTPUT_NAME% >nul
+echo - Copied to: %DIST_DIR%\%OUTPUT_NAME%
+
+echo.
+echo Build script completed successfully!
+echo ========================================