🔧 Fix encoding issues - Add English version scripts

Fix:
- Remove Chinese characters causing encoding errors
- Create pure English version scripts

New files:
- setup.bat: Simple configuration script (English)
- start_app.bat: Auto-deploy script (English)
- README_QUICKSTART.md: Quick start guide

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

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

start_app.bat

@@ -0,0 +1,121 @@
+@echo off
+title QQuiz - Starting Application
+color 0A
+
+echo.
+echo ========================================
+echo   QQuiz - Auto Deploy Script
+echo ========================================
+echo.
+
+cd /d "%~dp0"
+
+REM Check if .env exists
+if not exist ".env" (
+    echo ERROR: .env file not found!
+    echo Please run setup.bat first
+    pause
+    exit /b 1
+)
+
+echo [1/7] Checking Python...
+python --version >nul 2>&1
+if %errorlevel% neq 0 (
+    echo ERROR: Python not found!
+    echo Please install Python 3.11+ from https://www.python.org/
+    pause
+    exit /b 1
+)
+echo OK - Python installed
+echo.
+
+echo [2/7] Checking Node.js...
+node --version >nul 2>&1
+if %errorlevel% neq 0 (
+    echo ERROR: Node.js not found!
+    echo Please install Node.js 18+ from https://nodejs.org/
+    pause
+    exit /b 1
+)
+echo OK - Node.js installed
+echo.
+
+echo [3/7] Creating PostgreSQL database...
+echo.
+echo Please enter PostgreSQL admin password when prompted
+echo (Default password is usually: postgres)
+echo.
+
+set PGPASSWORD=postgres
+psql -U postgres -h localhost -c "DROP DATABASE IF EXISTS qquiz_db;" 2>nul
+psql -U postgres -h localhost -c "DROP USER IF EXISTS qquiz;" 2>nul
+psql -U postgres -h localhost -c "CREATE USER qquiz WITH PASSWORD 'qquiz_password';" 2>nul
+psql -U postgres -h localhost -c "CREATE DATABASE qquiz_db OWNER qquiz;" 2>nul
+
+echo Database setup complete
+echo.
+
+echo [4/7] Installing backend dependencies...
+cd backend
+
+if not exist "venv" (
+    python -m venv venv
+)
+
+call venv\Scripts\activate.bat
+pip install -q -r requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple
+
+echo Backend dependencies installed
+echo.
+
+echo [5/7] Running database migrations...
+alembic upgrade head 2>nul
+
+cd ..
+echo.
+
+echo [6/7] Installing frontend dependencies...
+cd frontend
+
+if not exist "node_modules" (
+    call npm config set registry https://registry.npmmirror.com
+    call npm install --silent
+)
+
+cd ..
+echo.
+
+echo [7/7] Starting services...
+echo.
+
+start "QQuiz Backend" cmd /k "cd /d %~dp0backend && call venv\Scripts\activate.bat && echo Backend API: http://localhost:8000 && echo API Docs: http://localhost:8000/docs && echo. && uvicorn main:app --reload"
+
+timeout /t 5 /nobreak >nul
+
+start "QQuiz Frontend" cmd /k "cd /d %~dp0frontend && echo Frontend: http://localhost:3000 && echo. && npm start"
+
+timeout /t 3 /nobreak >nul
+
+echo.
+echo ========================================
+echo   SUCCESS! QQuiz is starting...
+echo ========================================
+echo.
+echo Frontend: http://localhost:3000
+echo Backend:  http://localhost:8000
+echo API Docs: http://localhost:8000/docs
+echo.
+echo Default login:
+echo   Username: admin
+echo   Password: admin123
+echo.
+echo ========================================
+echo.
+
+timeout /t 5 /nobreak >nul
+start http://localhost:3000
+
+echo System is running...
+echo Close backend and frontend windows to stop
+echo.
+pause