🔧 Fix alembic config and add Docker database support

Fix:
- Fix alembic.ini version_path_separator syntax error
- Add scripts to start with Docker database
- Add automatic fix and start script

New files:
- start_with_docker_db.bat: Start with Docker PostgreSQL
- fix_and_start.bat: Auto-fix and start with options

🚀 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

start_with_docker_db.bat

@@ -0,0 +1,73 @@
+@echo off
+title QQuiz - Start with Docker Database
+color 0B
+
+echo.
+echo ========================================
+echo   QQuiz - Starting with Docker DB
+echo ========================================
+echo.
+
+cd /d "%~dp0"
+
+echo [1/4] Checking Docker...
+docker --version >nul 2>&1
+if %errorlevel% neq 0 (
+    echo ERROR: Docker not found!
+    echo Please install Docker Desktop from https://www.docker.com/
+    pause
+    exit /b 1
+)
+echo OK - Docker installed
+echo.
+
+echo [2/4] Starting PostgreSQL in Docker...
+docker-compose up -d postgres
+
+if %errorlevel% neq 0 (
+    echo ERROR: Failed to start PostgreSQL
+    echo Try: docker-compose down
+    echo Then run this script again
+    pause
+    exit /b 1
+)
+
+echo OK - PostgreSQL started
+echo Waiting for database to be ready...
+timeout /t 5 /nobreak >nul
+echo.
+
+echo [3/4] Starting Backend...
+start "QQuiz Backend" cmd /k "cd /d %~dp0backend && call venv\Scripts\activate.bat && echo ======================================== && echo   QQuiz Backend Server && echo ======================================== && echo. && echo API: http://localhost:8000 && echo Docs: http://localhost:8000/docs && echo. && alembic upgrade head && echo. && uvicorn main:app --reload"
+
+echo Waiting for backend to start...
+timeout /t 8 /nobreak >nul
+echo.
+
+echo [4/4] Starting Frontend...
+start "QQuiz Frontend" cmd /k "cd /d %~dp0frontend && echo ======================================== && echo   QQuiz Frontend Server && echo ======================================== && echo. && echo URL: http://localhost:3000 && echo. && npm start"
+
+echo.
+echo ========================================
+echo   SUCCESS! QQuiz is starting...
+echo ========================================
+echo.
+echo Frontend: http://localhost:3000
+echo Backend:  http://localhost:8000
+echo Database: Running in Docker
+echo.
+echo Login:
+echo   Username: admin
+echo   Password: admin123
+echo.
+echo ========================================
+echo.
+
+timeout /t 5 /nobreak >nul
+start http://localhost:3000
+
+echo System running...
+echo To stop: Close the backend/frontend windows
+echo To stop database: docker-compose down
+echo.
+pause