chore: sync local updates

mengyaping-backend/build-linux-amd64.bat

@@ -0,0 +1,35 @@
+@echo off
+chcp 65001 >nul 2>&1
+setlocal
+cd /d "%~dp0"
+
+where go >nul 2>nul
+if errorlevel 1 (
+    echo [ERROR] Go not found in PATH. Install Go and reopen the terminal.
+    pause
+    exit /b 1
+)
+
+set "DIST=dist"
+if not exist "%DIST%" mkdir "%DIST%"
+
+set "GOOS=linux"
+set "GOARCH=amd64"
+set "CGO_ENABLED=0"
+
+echo Cross-compile linux/amd64 -^> "%DIST%\mengyaping-backend"
+go version
+go build -trimpath -ldflags="-s -w" -o "%DIST%\mengyaping-backend" .
+if errorlevel 1 (
+    echo.
+    echo [ERROR] go build failed. See messages above.
+    echo Tips: go.mod requires Go 1.25+; run from mengyaping-backend folder.
+    pause
+    exit /b 1
+)
+
+echo.
+echo [OK] "%CD%\%DIST%\mengyaping-backend"
+echo Next: copy this folder to server, then: docker compose build
+endlocal
+exit /b 0