Add Windows clear-go-cache.bat helper

scripts/clear-go-cache.bat

@@ -0,0 +1,26 @@
+@echo off
+setlocal
+echo ============================================================
+echo   VideoTools Go Cache Cleaner (Windows)
+echo ============================================================
+echo.
+
+where go >nul 2>&1
+if %ERRORLEVEL% neq 0 (
+  echo Go is not installed or not in PATH. Skipping go clean.
+) else (
+  echo Running: go clean -cache -modcache -testcache
+  go clean -cache -modcache -testcache
+)
+
+set CACHE_DIR=%LOCALAPPDATA%\go-build
+if exist "%CACHE_DIR%" (
+  echo Removing build cache dir: "%CACHE_DIR%"
+  rmdir /s /q "%CACHE_DIR%"
+) else (
+  echo No cache directory found at "%CACHE_DIR%" (nothing to remove).
+)
+
+echo.
+echo Done. Re-run scripts\build.bat to rebuild VideoTools.
+endlocal