添加windows打包逻辑

packaging/windows/templates/start_web.bat

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+@echo off
+chcp 65001 >nul
+setlocal enabledelayedexpansion
+
+echo ========================================
+echo   Pixelle-Video - Web UI Launcher
+echo ========================================
+echo.
+
+:: Set environment variables
+set "PYTHON_HOME=%~dp0python\python311"
+set "PATH=%PYTHON_HOME%;%PYTHON_HOME%\Scripts;%~dp0tools\ffmpeg\bin;%PATH%"
+set "PROJECT_ROOT=%~dp0Pixelle-Video"
+
+:: Change to project directory
+cd /d "%PROJECT_ROOT%"
+
+:: Set PYTHONPATH to project root for module imports
+set "PYTHONPATH=%PROJECT_ROOT%"
+
+:: Start Web UI (Standalone mode)
+echo [Starting] Launching Pixelle-Video Web UI (Standalone)...
+echo Browser will open at: http://localhost:8501
+echo.
+echo NOTE: This runs Web UI only. For full features, use start.bat
+echo       or run start_api.bat in another window.
+echo Note: Configure API keys and settings in the Web UI.
+echo.
+echo Press Ctrl+C to stop the server
+echo ========================================
+echo.
+
+"%PYTHON_HOME%\python.exe" -m streamlit run web\app.py
+
+if errorlevel 1 (
+    echo.
+    echo [ERROR] Failed to start. Please check:
+    echo   1. Python is properly installed
+    echo   2. Dependencies are installed
+    echo   3. Port 8501 is not already in use
+    echo.
+    pause
+)
+