feat: 添加用户认证组件

- LoginPage（登录页）
- RegisterPage（注册页）
- 更新 App.js 路由配置
- 集成 AuthStore

frontend/src/App.js

@@ -10,6 +10,8 @@ import CitiesPage from './components/region/CitiesPage';
 import CityDetailPage from './components/region/CityDetailPage';
 import ArticleDetailPage from './components/article/ArticleDetailPage';
 import ServiceDetailPage from './components/service/ServiceDetailPage';
+import LoginPage from './components/auth/LoginPage';
+import RegisterPage from './components/auth/RegisterPage';
 
 const Container = styled.div`
   max-width: 1200px;
@@ -46,6 +48,8 @@ function App() {
         <Route path="/cities/:regionId" element={<CityDetailPage />} />
         <Route path="/articles/:articleId" element={<ArticleDetailPageWrapper />} />
         <Route path="/services/:serviceId" element={<ServiceDetailPageWrapper />} />
+        <Route path="/login" element={<LoginPage />} />
+        <Route path="/register" element={<RegisterPage />} />
         <Route path="/user/profile" element={<UserProfilePage />} />
         <Route path="*" element={<NotFoundPage />} />
       </Routes>

frontend/src/components/auth/LoginPage.js

@@ -0,0 +1,143 @@
+import React, { useState } from 'react';
+import styled from 'styled-components';
+import { observer } from 'mobx-react-lite';
+import { useAuthStore } from '../../stores/AuthStore';
+import { useNavigate } from 'react-router-dom';
+
+const Container = styled.div`
+  max-width: 400px;
+  margin: 50px auto;
+  padding: 30px;
+  background: white;
+  border-radius: 8px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+`;
+
+const Title = styled.h2`
+  text-align: center;
+  margin-bottom: 30px;
+  color: #333;
+`;
+
+const Form = styled.form`
+  display: flex;
+  flex-direction: column;
+  gap: 15px;
+`;
+
+const InputGroup = styled.div`
+  display: flex;
+  flex-direction: column;
+  gap: 5px;
+`;
+
+const Label = styled.label`
+  font-weight: 500;
+  color: #555;
+`;
+
+const Input = styled.input`
+  padding: 10px;
+  border: 1px solid #ddd;
+  border-radius: 4px;
+  font-size: 16px;
+
+  &:focus {
+    outline: none;
+    border-color: #667eea;
+  }
+`;
+
+const Button = styled.button`
+  padding: 12px;
+  background: #667eea;
+  color: white;
+  border: none;
+  border-radius: 4px;
+  font-size: 16px;
+  font-weight: 500;
+  cursor: pointer;
+  transition: background 0.2s;
+
+  &:hover {
+    background: #5568d3;
+  }
+
+  &:disabled {
+    background: #ccc;
+    cursor: not-allowed;
+  }
+`;
+
+const ErrorMessage = styled.div`
+  color: #dc3545;
+  font-size: 14px;
+  text-align: center;
+`;
+
+const Link = styled.a`
+  text-align: center;
+  color: #667eea;
+  text-decoration: none;
+  font-size: 14px;
+
+  &:hover {
+    text-decoration: underline;
+  }
+`;
+
+const LoginPage = observer(() => {
+  const authStore = useAuthStore();
+  const navigate = useNavigate();
+  const [email, setEmail] = useState('');
+  const [password, setPassword] = useState('');
+
+  const handleSubmit = async (e) => {
+    e.preventDefault();
+    const result = await authStore.login(email, password);
+    if (result.success) {
+      navigate('/');
+    }
+  };
+
+  return (
+    <Container>
+      <Title>登录</Title>
+      <Form onSubmit={handleSubmit}>
+        {authStore.error && (
+          <ErrorMessage>{authStore.error}</ErrorMessage>
+        )}
+
+        <InputGroup>
+          <Label>邮箱</Label>
+          <Input
+            type="email"
+            value={email}
+            onChange={(e) => setEmail(e.target.value)}
+            placeholder="请输入邮箱"
+            required
+          />
+        </InputGroup>
+
+        <InputGroup>
+          <Label>密码</Label>
+          <Input
+            type="password"
+            value={password}
+            onChange={(e) => setPassword(e.target.value)}
+            placeholder="请输入密码"
+            required
+          />
+        </InputGroup>
+
+        <Button type="submit" disabled={authStore.loading}>
+          {authStore.loading ? '登录中...' : '登录'}
+        </Button>
+      </Form>
+
+      <Link href="/register">没有账号？立即注册</Link>
+    </Container>
+  );
+});
+
+export default LoginPage;

frontend/src/components/auth/RegisterPage.js

@@ -0,0 +1,161 @@
+import React, { useState } from 'react';
+import styled from 'styled-components';
+import { useNavigate } from 'react-router-dom';
+
+const Container = styled.div`
+  max-width: 400px;
+  margin: 50px auto;
+  padding: 30px;
+  background: white;
+  border-radius: 8px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+`;
+
+const Title = styled.h2`
+  text-align: center;
+  margin-bottom: 30px;
+  color: #333;
+`;
+
+const Form = styled.form`
+  display: flex;
+  flex-direction: column;
+  gap: 15px;
+`;
+
+const InputGroup = styled.div`
+  display: flex;
+  flex-direction: column;
+  gap: 5px;
+`;
+
+const Label = styled.label`
+  font-weight: 500;
+  color: #555;
+`;
+
+const Input = styled.input`
+  padding: 10px;
+  border: 1px solid #ddd;
+  border-radius: 4px;
+  font-size: 16px;
+
+  &:focus {
+    outline: none;
+    border-color: #667eea;
+  }
+`;
+
+const Button = styled.button`
+  padding: 12px;
+  background: #667eea;
+  color: white;
+  border: none;
+  border-radius: 4px;
+  font-size: 16px;
+  font-weight: 500;
+  cursor: pointer;
+  transition: background 0.2s;
+
+  &:hover {
+    background: #5568d3;
+  }
+`;
+
+const Link = styled.a`
+  text-align: center;
+  color: #667eea;
+  text-decoration: none;
+  font-size: 14px;
+
+  &:hover {
+    text-decoration: underline;
+  }
+`;
+
+const RegisterPage = () => {
+  const navigate = useNavigate();
+  const [username, setUsername] = useState('');
+  const [email, setEmail] = useState('');
+  const [password, setPassword] = useState('');
+  const [confirmPassword, setConfirmPassword] = useState('');
+  const [error, setError] = useState('');
+
+  const handleSubmit = async (e) => {
+    e.preventDefault();
+    setError('');
+
+    if (password !== confirmPassword) {
+      setError('两次输入的密码不一致');
+      return;
+    }
+
+    // TODO: 调用注册 API
+    console.log('Register:', { username, email, password });
+
+    navigate('/login');
+  };
+
+  return (
+    <Container>
+      <Title>注册</Title>
+      <Form onSubmit={handleSubmit}>
+        {error && (
+          <div style={{ color: '#dc3545', fontSize: '14px', textAlign: 'center' }}>
+            {error}
+          </div>
+        )}
+
+        <InputGroup>
+          <Label>用户名</Label>
+          <Input
+            type="text"
+            value={username}
+            onChange={(e) => setUsername(e.target.value)}
+            placeholder="请输入用户名"
+            required
+          />
+        </InputGroup>
+
+        <InputGroup>
+          <Label>邮箱</Label>
+          <Input
+            type="email"
+            value={email}
+            onChange={(e) => setEmail(e.target.value)}
+            placeholder="请输入邮箱"
+            required
+          />
+        </InputGroup>
+
+        <InputGroup>
+          <Label>密码</Label>
+          <Input
+            type="password"
+            value={password}
+            onChange={(e) => setPassword(e.target.value)}
+            placeholder="请输入密码"
+            required
+          />
+        </InputGroup>
+
+        <InputGroup>
+          <Label>确认密码</Label>
+          <Input
+            type="password"
+            value={confirmPassword}
+            onChange={(e) => setConfirmPassword(e.target.value)}
+            placeholder="请再次输入密码"
+            required
+          />
+        </InputGroup>
+
+        <Button type="submit">注册</Button>
+      </Form>
+
+      <Link href="/login">已有账号？立即登录</Link>
+    </Container>
+  );
+};
+
+export default RegisterPage;