feat(auth): 实现登录注册功能并重构 App 组件

- 新增登录和注册页面组件
- 实现用户认证和权限管理逻辑
- 重构 App 组件,使用 Router 和 AuthProvider
- 添加管理员面板和论坛页面组件

Change-Id: Iaa4502616970e75e3268537f73c75dac8f60e24d
diff --git a/src/features/auth/pages/LoginPage.jsx b/src/features/auth/pages/LoginPage.jsx
new file mode 100644
index 0000000..19434a4
--- /dev/null
+++ b/src/features/auth/pages/LoginPage.jsx
@@ -0,0 +1,155 @@
+// src/features/auth/pages/LoginPage.jsx
+import React, { useState } from "react";
+import { useNavigate, Link } from "react-router-dom";
+import {
+  Form,
+  Input,
+  Button,
+  Checkbox,
+  Card,
+  Typography,
+  Space,
+  Divider,
+  message,
+} from "antd";
+import { UserOutlined, LockOutlined } from "@ant-design/icons";
+import { useAuth } from "../contexts/AuthContext"; // 使用新的 AuthContext
+// import { loginUser } from '../services/authApi'; // 如果不直接在 context 中调用 API
+
+const { Title, Text } = Typography;
+
+const LoginPage = () => {
+  const [loading, setLoading] = useState(false);
+  const navigate = useNavigate();
+  const { login, isAuthenticated, user } = useAuth(); // 从 Context 获取 login 方法等
+
+  React.useEffect(() => {
+    // 如果已经登录,并且有用户信息,则重定向到首页
+    if (isAuthenticated && user) {
+      navigate("/");
+    }
+  }, [isAuthenticated, user, navigate]);
+
+  const onFinish = async (values) => {
+    setLoading(true);
+    try {
+      await login({ username: values.username, password: values.password });
+      // 登录成功后的导航由 AuthContext 内部或 ProtectedRoute 处理
+      // AuthContext 已经包含成功提示,这里不再重复提示
+      navigate("/"); // 或者根据用户角色导航到不同页面
+    } catch (error) {
+      // 错误消息由 AuthContext 中的 login 方法或 request 拦截器处理
+      console.error("Login page error:", error);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div className="flex justify-center items-center min-h-screen bg-slate-100 p-4">
+      {" "}
+      {/* Tailwind: bg-gray-100 -> bg-slate-100 */}
+      <Card className="w-full max-w-md shadow-lg rounded-lg">
+        {" "}
+        {/* Tailwind: rounded-lg */}
+        <div className="text-center mb-8">
+          {" "}
+          {/* Tailwind: mb-6 -> mb-8 */}
+          <Title level={2} className="!mb-2 text-slate-700">
+            PT站登录
+          </Title>{" "}
+          {/* Tailwind: text-slate-700 */}
+          <Text type="secondary">欢迎回来,请登录您的账号</Text>
+        </div>
+        <Form
+          name="login_form" // 最好给表单一个唯一的名字
+          initialValues={{ remember: true }}
+          onFinish={onFinish}
+          size="large"
+          layout="vertical"
+          className="space-y-6" // Tailwind: 间距控制
+        >
+          <Form.Item
+            name="username"
+            rules={[{ required: true, message: "请输入您的用户名!" }]}
+          >
+            <Input
+              prefix={<UserOutlined className="site-form-item-icon" />}
+              placeholder="用户名"
+            />
+          </Form.Item>
+          <Form.Item
+            name="password"
+            rules={[{ required: true, message: "请输入您的密码!" }]}
+          >
+            <Input.Password
+              prefix={<LockOutlined className="site-form-item-icon" />}
+              placeholder="密码"
+            />
+          </Form.Item>
+          <Form.Item className="!mb-0">
+            {" "}
+            {/* Tailwind: !mb-0 覆盖antd默认margin */}
+            <div className="flex justify-between items-center">
+              <Form.Item name="remember" valuePropName="checked" noStyle>
+                <Checkbox>记住我</Checkbox>
+              </Form.Item>
+              <Link
+                to="/forgot-password"
+                className="text-blue-600 hover:text-blue-700 hover:underline"
+              >
+                {" "}
+                {/* Tailwind: hover:underline */}
+                忘记密码?
+              </Link>
+            </div>
+          </Form.Item>
+          <Form.Item>
+            <Button
+              type="primary"
+              htmlType="submit"
+              className="w-full !text-base"
+              loading={loading}
+            >
+              {" "}
+              {/* Tailwind: !text-base (示例) */}登 录
+            </Button>
+          </Form.Item>
+          <Divider plain>
+            <span className="text-slate-500">或</span>
+          </Divider>{" "}
+          {/* Tailwind: text-slate-500 */}
+          <div className="text-center">
+            <Text type="secondary" className="mr-1">
+              还没有账号?
+            </Text>
+            <Link
+              to="/register"
+              className="font-medium text-blue-600 hover:text-blue-700 hover:underline"
+            >
+              立即注册
+            </Link>
+          </div>
+        </Form>
+        {/* 提示信息部分可以保留或移除 */}
+        <div className="mt-8 p-4 bg-slate-50 rounded-md border border-slate-200">
+          {" "}
+          {/* Tailwind: border, border-slate-200 */}
+          <Text
+            type="secondary"
+            className="block mb-2 font-semibold text-slate-600"
+          >
+            测试账号提示
+          </Text>
+          <ul className="space-y-1 text-sm text-slate-500 list-disc list-inside">
+            <li>管理员: admin / admin123</li>
+            <li>普通用户: user / user123</li>
+            {/* ...其他测试账号 */}
+          </ul>
+        </div>
+      </Card>
+    </div>
+  );
+};
+
+export default LoginPage;