Add Douyin video downloader with auto-cookie feature

启动UI.bat

@@ -0,0 +1,32 @@
+@echo off
+chcp 65001 >nul
+cd /d "%~dp0"
+
+echo ====================================
+echo  Douyin Downloader v3.0
+echo  Auto Cookie - No Login Required
+echo ====================================
+echo.
+
+if not exist "C:\Program Files\Python311\python.exe" (
+    echo [ERROR] Python not found
+    pause
+    exit /b 1
+)
+
+echo [CHECK] Checking dependencies...
+"C:\Program Files\Python311\python.exe" -c "import selenium" 2>nul
+if errorlevel 1 (
+    echo [INSTALL] Installing dependencies...
+    "C:\Program Files\Python311\python.exe" -m pip install selenium webdriver-manager -q
+    echo [INSTALL] Done
+)
+
+echo [START] Launching...
+"C:\Program Files\Python311\python.exe" douyin_ui.py
+
+if errorlevel 1 (
+    echo.
+    echo [ERROR] Program error
+    pause
+)