Add Windows build automation with GitHub Actions

- Add comprehensive GitHub Actions workflow for Windows builds
- Create local and CI-specific batch files for building
- Configure export templates and build optimization
- Update export presets for proper .pck embedding and git plugin exclusion
- Set up automated releases with proper build artifacts

build-windows.bat

@@ -1,22 +1,50 @@
 @echo off
+setlocal
+
 echo Building PNGTuber Plus for Windows...
 
-:: Create build directory
+rem Create build directory
 if not exist "build\windows" mkdir "build\windows"
 
-:: Build the project
+rem Install export templates if they don't exist
+echo Checking for export templates...
+set TEMPLATE_DIR=%APPDATA%\Godot\export_templates\4.4.1.stable
+if not exist "%TEMPLATE_DIR%" (
+    echo Export templates not found. Installing...
+    "D:\Godot\Godot_v4.4.1-stable_win64.exe" --headless --export-pack
+    timeout /t 5 /nobreak >nul
+    
+    rem Download templates if the export-pack didn't work
+    if not exist "%TEMPLATE_DIR%" (
+        echo Downloading export templates...
+        powershell -Command "& {Invoke-WebRequest -Uri 'https://github.com/godotengine/godot/releases/download/4.4.1-stable/Godot_v4.4.1-stable_export_templates.tpz' -OutFile 'templates.tpz'}"
+        
+        rem Rename and extract templates
+        powershell -Command "& {Rename-Item 'templates.tpz' 'templates.zip'}"
+        powershell -Command "& {Expand-Archive -Path 'templates.zip' -DestinationPath 'temp_templates' -Force}"
+        if not exist "%APPDATA%\Godot\export_templates" mkdir "%APPDATA%\Godot\export_templates"
+        move "temp_templates\templates" "%TEMPLATE_DIR%"
+        rmdir /s /q "temp_templates"
+        del "templates.zip"
+        echo Export templates installed.
+    )
+) else (
+    echo Export templates found.
+)
+
+rem Build the project
 echo Running Godot export...
-godot --headless --verbose --export-release "Windows Desktop" "build\windows\PNGTuber-Plus.exe"
+"D:\Godot\Godot_v4.4.1-stable_win64.exe" --headless --export-release "Windows Desktop" "build\windows\PNGTuber-Plus.exe"
 
 if %ERRORLEVEL% EQU 0 (
     echo.
-    echo ✅ Build completed successfully!
+    echo Build completed successfully!
     echo Output: build\windows\PNGTuber-Plus.exe
     echo.
-    pause
 ) else (
     echo.
-    echo ❌ Build failed with error code %ERRORLEVEL%
+    echo Build failed with error code %ERRORLEVEL%
     echo.
-    pause
 )
+
+pause