🎉 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/Dashboard.jsx

@@ -0,0 +1,197 @@
+/**
+ * Dashboard Page
+ */
+import React, { useState, useEffect } from 'react'
+import { useNavigate } from 'react-router-dom'
+import { examAPI, mistakeAPI } from '../api/client'
+import { useAuth } from '../context/AuthContext'
+import Layout from '../components/Layout'
+import {
+  FolderOpen, XCircle, TrendingUp, BookOpen, ArrowRight, Settings
+} from 'lucide-react'
+import { getStatusColor, getStatusText, formatRelativeTime, calculateProgress } from '../utils/helpers'
+
+export const Dashboard = () => {
+  const { user, isAdmin } = useAuth()
+  const navigate = useNavigate()
+
+  const [stats, setStats] = useState({
+    totalExams: 0,
+    totalQuestions: 0,
+    completedQuestions: 0,
+    mistakeCount: 0
+  })
+
+  const [recentExams, setRecentExams] = useState([])
+  const [loading, setLoading] = useState(true)
+
+  useEffect(() => {
+    loadDashboardData()
+  }, [])
+
+  const loadDashboardData = async () => {
+    try {
+      const [examsRes, mistakesRes] = await Promise.all([
+        examAPI.getList(0, 5),
+        mistakeAPI.getList(0, 1)
+      ])
+
+      const exams = examsRes.data.exams
+
+      // Calculate stats
+      const totalQuestions = exams.reduce((sum, e) => sum + e.total_questions, 0)
+      const completedQuestions = exams.reduce((sum, e) => sum + e.current_index, 0)
+
+      setStats({
+        totalExams: exams.length,
+        totalQuestions,
+        completedQuestions,
+        mistakeCount: mistakesRes.data.total
+      })
+
+      setRecentExams(exams)
+    } catch (error) {
+      console.error('Failed to load dashboard:', error)
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  return (
+    <Layout>
+      <div className="p-4 md:p-8">
+        {/* Welcome */}
+        <div className="mb-8">
+          <h1 className="text-2xl md:text-3xl font-bold text-gray-900">
+            欢迎回来，{user?.username}！
+          </h1>
+          <p className="text-gray-600 mt-1">继续你的学习之旅</p>
+        </div>
+
+        {/* Stats Cards */}
+        <div className="grid grid-cols-2 lg:grid-cols-4 gap-4 mb-8">
+          <div
+            className="bg-white rounded-xl shadow-sm p-6 cursor-pointer hover:shadow-md transition-shadow"
+            onClick={() => navigate('/exams')}
+          >
+            <div className="flex items-center gap-3 mb-2">
+              <div className="bg-primary-100 p-2 rounded-lg">
+                <FolderOpen className="h-5 w-5 text-primary-600" />
+              </div>
+              <span className="text-2xl font-bold text-gray-900">{stats.totalExams}</span>
+            </div>
+            <p className="text-sm text-gray-600">题库总数</p>
+          </div>
+
+          <div className="bg-white rounded-xl shadow-sm p-6">
+            <div className="flex items-center gap-3 mb-2">
+              <div className="bg-blue-100 p-2 rounded-lg">
+                <BookOpen className="h-5 w-5 text-blue-600" />
+              </div>
+              <span className="text-2xl font-bold text-gray-900">{stats.totalQuestions}</span>
+            </div>
+            <p className="text-sm text-gray-600">题目总数</p>
+          </div>
+
+          <div className="bg-white rounded-xl shadow-sm p-6">
+            <div className="flex items-center gap-3 mb-2">
+              <div className="bg-green-100 p-2 rounded-lg">
+                <TrendingUp className="h-5 w-5 text-green-600" />
+              </div>
+              <span className="text-2xl font-bold text-gray-900">{stats.completedQuestions}</span>
+            </div>
+            <p className="text-sm text-gray-600">已完成</p>
+          </div>
+
+          <div
+            className="bg-white rounded-xl shadow-sm p-6 cursor-pointer hover:shadow-md transition-shadow"
+            onClick={() => navigate('/mistakes')}
+          >
+            <div className="flex items-center gap-3 mb-2">
+              <div className="bg-red-100 p-2 rounded-lg">
+                <XCircle className="h-5 w-5 text-red-600" />
+              </div>
+              <span className="text-2xl font-bold text-gray-900">{stats.mistakeCount}</span>
+            </div>
+            <p className="text-sm text-gray-600">错题数量</p>
+          </div>
+        </div>
+
+        {/* Recent Exams */}
+        <div className="bg-white rounded-xl shadow-sm p-6">
+          <div className="flex items-center justify-between mb-6">
+            <h2 className="text-xl font-bold text-gray-900">最近的题库</h2>
+            <button
+              onClick={() => navigate('/exams')}
+              className="text-primary-600 hover:text-primary-700 flex items-center gap-1 text-sm font-medium"
+            >
+              查看全部
+              <ArrowRight className="h-4 w-4" />
+            </button>
+          </div>
+
+          {recentExams.length === 0 ? (
+            <div className="text-center py-8">
+              <FolderOpen className="h-12 w-12 text-gray-300 mx-auto mb-3" />
+              <p className="text-gray-500">还没有题库，快去创建一个吧！</p>
+            </div>
+          ) : (
+            <div className="space-y-3">
+              {recentExams.map((exam) => (
+                <div
+                  key={exam.id}
+                  onClick={() => navigate(`/exams/${exam.id}`)}
+                  className="border border-gray-200 rounded-lg p-4 hover:border-primary-300 hover:bg-primary-50 transition-all cursor-pointer"
+                >
+                  <div className="flex items-start justify-between mb-2">
+                    <h3 className="font-semibold text-gray-900">{exam.title}</h3>
+                    <span className={`px-2 py-1 text-xs font-medium rounded-full ${getStatusColor(exam.status)}`}>
+                      {getStatusText(exam.status)}
+                    </span>
+                  </div>
+
+                  <div className="flex items-center justify-between text-sm text-gray-600">
+                    <span>
+                      {exam.current_index} / {exam.total_questions} 题
+                    </span>
+                    <span>{formatRelativeTime(exam.updated_at)}</span>
+                  </div>
+
+                  {exam.total_questions > 0 && (
+                    <div className="w-full bg-gray-200 rounded-full h-2 mt-3">
+                      <div
+                        className="bg-primary-600 h-2 rounded-full transition-all"
+                        style={{ width: `${calculateProgress(exam.current_index, exam.total_questions)}%` }}
+                      ></div>
+                    </div>
+                  )}
+                </div>
+              ))}
+            </div>
+          )}
+        </div>
+
+        {/* Admin Quick Access */}
+        {isAdmin && (
+          <div className="mt-6 bg-gradient-to-r from-primary-500 to-primary-600 rounded-xl shadow-sm p-6 text-white">
+            <div className="flex items-center justify-between">
+              <div>
+                <h3 className="font-semibold mb-1">管理员功能</h3>
+                <p className="text-sm text-primary-100">配置系统设置</p>
+              </div>
+              <button
+                onClick={() => navigate('/admin/settings')}
+                className="bg-white text-primary-600 px-4 py-2 rounded-lg font-medium hover:bg-primary-50 transition-colors flex items-center gap-2"
+              >
+                <Settings className="h-5 w-5" />
+                系统设置
+              </button>
+            </div>
+          </div>
+        )}
+      </div>
+    </Layout>
+  )
+}
+
+export default Dashboard