🎉 Initial commit: QQuiz - 智能刷题与题库管理平台

## 功能特性

✅ **核心功能**
- 多文件上传与智能去重（基于 content_hash）
- 异步文档解析（支持 TXT/PDF/DOCX/XLSX）
- AI 智能题目提取与评分（OpenAI/Anthropic/Qwen）
- 断点续做与进度管理
- 自动错题本收集

✅ **技术栈**
- Backend: FastAPI + SQLAlchemy 2.0 + PostgreSQL
- Frontend: React 18 + Vite + Tailwind CSS
- Deployment: Docker Compose

✅ **项目结构**
- 53 个文件
- 完整的前后端分离架构
- Docker/源码双模部署支持

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

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

frontend/src/pages/Register.jsx

@@ -0,0 +1,159 @@
+/**
+ * Register Page
+ */
+import React, { useState } from 'react'
+import { Link, useNavigate } from 'react-router-dom'
+import { useAuth } from '../context/AuthContext'
+import { BookOpen } from 'lucide-react'
+
+export const Register = () => {
+  const navigate = useNavigate()
+  const { register } = useAuth()
+
+  const [formData, setFormData] = useState({
+    username: '',
+    password: '',
+    confirmPassword: ''
+  })
+  const [loading, setLoading] = useState(false)
+  const [error, setError] = useState('')
+
+  const handleSubmit = async (e) => {
+    e.preventDefault()
+    setError('')
+
+    // Validate
+    if (formData.password !== formData.confirmPassword) {
+      setError('两次输入的密码不一致')
+      return
+    }
+
+    if (formData.password.length < 6) {
+      setError('密码至少需要 6 位')
+      return
+    }
+
+    setLoading(true)
+
+    try {
+      const success = await register(formData.username, formData.password)
+      if (success) {
+        navigate('/login')
+      }
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  const handleChange = (e) => {
+    setFormData({
+      ...formData,
+      [e.target.name]: e.target.value
+    })
+    setError('')
+  }
+
+  return (
+    <div className="min-h-screen bg-gradient-to-br from-primary-50 to-primary-100 flex items-center justify-center p-4">
+      <div className="max-w-md w-full">
+        {/* Logo and Title */}
+        <div className="text-center mb-8">
+          <div className="flex justify-center mb-4">
+            <div className="bg-primary-600 p-3 rounded-2xl">
+              <BookOpen className="h-10 w-10 text-white" />
+            </div>
+          </div>
+          <h1 className="text-3xl font-bold text-gray-900">QQuiz</h1>
+          <p className="text-gray-600 mt-2">智能刷题与题库管理平台</p>
+        </div>
+
+        {/* Register Form */}
+        <div className="bg-white rounded-2xl shadow-xl p-8">
+          <h2 className="text-2xl font-bold text-gray-900 mb-6">注册</h2>
+
+          <form onSubmit={handleSubmit} className="space-y-6">
+            {/* Error Message */}
+            {error && (
+              <div className="bg-red-50 text-red-600 px-4 py-3 rounded-lg text-sm">
+                {error}
+              </div>
+            )}
+
+            {/* Username */}
+            <div>
+              <label className="block text-sm font-medium text-gray-700 mb-2">
+                用户名
+              </label>
+              <input
+                type="text"
+                name="username"
+                value={formData.username}
+                onChange={handleChange}
+                required
+                minLength={3}
+                maxLength={50}
+                className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-primary-500 focus:border-transparent"
+                placeholder="3-50 位字符"
+              />
+            </div>
+
+            {/* Password */}
+            <div>
+              <label className="block text-sm font-medium text-gray-700 mb-2">
+                密码
+              </label>
+              <input
+                type="password"
+                name="password"
+                value={formData.password}
+                onChange={handleChange}
+                required
+                minLength={6}
+                className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-primary-500 focus:border-transparent"
+                placeholder="至少 6 位"
+              />
+            </div>
+
+            {/* Confirm Password */}
+            <div>
+              <label className="block text-sm font-medium text-gray-700 mb-2">
+                确认密码
+              </label>
+              <input
+                type="password"
+                name="confirmPassword"
+                value={formData.confirmPassword}
+                onChange={handleChange}
+                required
+                minLength={6}
+                className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-primary-500 focus:border-transparent"
+                placeholder="再次输入密码"
+              />
+            </div>
+
+            {/* Submit Button */}
+            <button
+              type="submit"
+              disabled={loading}
+              className="w-full bg-primary-600 text-white py-3 rounded-lg font-medium hover:bg-primary-700 transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
+            >
+              {loading ? '注册中...' : '注册'}
+            </button>
+          </form>
+
+          {/* Login Link */}
+          <div className="mt-6 text-center">
+            <p className="text-gray-600">
+              已有账号？{' '}
+              <Link to="/login" className="text-primary-600 font-medium hover:text-primary-700">
+                立即登录
+              </Link>
+            </p>
+          </div>
+        </div>
+      </div>
+    </div>
+  )
+}
+
+export default Register