Update SproutGate

sproutgate-backend/build-linux-amd64.bat

@@ -0,0 +1,58 @@
+@echo off
+setlocal
+
+set "SCRIPT_DIR=%~dp0"
+cd /d "%SCRIPT_DIR%"
+if errorlevel 1 goto fail_cd
+
+set "APP_NAME=sproutgate-backend"
+set "DIST_DIR=%SCRIPT_DIR%dist"
+set "OUTPUT_FILE=%DIST_DIR%\%APP_NAME%"
+set "GOCACHE_DIR=%TEMP%\%APP_NAME%-gocache"
+
+where go >nul 2>nul
+if errorlevel 1 goto fail_go
+
+if not exist "%DIST_DIR%" mkdir "%DIST_DIR%"
+if errorlevel 1 goto fail_dist
+
+if not exist "%GOCACHE_DIR%" mkdir "%GOCACHE_DIR%"
+
+echo [INFO] Working directory: %CD%
+echo [INFO] Building %APP_NAME% for linux amd64...
+echo [INFO] Output: %OUTPUT_FILE%
+
+set "CGO_ENABLED=0"
+set "GOOS=linux"
+set "GOARCH=amd64"
+set "GOCACHE=%GOCACHE_DIR%"
+
+echo [INFO] Regenerating Swagger docs (swag)...
+go run github.com/swaggo/swag/cmd/swag@latest init -g main.go -o docs --parseInternal
+if errorlevel 1 goto fail_build
+
+go build -trimpath -ldflags "-s -w" -o "%OUTPUT_FILE%" .
+if errorlevel 1 goto fail_build
+
+echo [OK] Build completed: %OUTPUT_FILE%
+exit /b 0
+
+:fail_cd
+echo [ERROR] Cannot change to script directory: %SCRIPT_DIR%
+goto pause_and_exit
+
+:fail_go
+echo [ERROR] Go was not found in PATH.
+goto pause_and_exit
+
+:fail_dist
+echo [ERROR] Cannot create output directory: %DIST_DIR%
+goto pause_and_exit
+
+:fail_build
+echo [ERROR] Build failed. Check the Go output above.
+goto pause_and_exit
+
+:pause_and_exit
+pause
+exit /b 1