feat: 完成TikTok短剧管理后台基础功能开发

本次提交搭建了完整的后台管理系统，包含：
1.  登录认证与权限校验体系
2.  工作台、短剧、用户、角色、人员、日志等全业务模块
3.  响应式布局与通用样式组件
4.  菜单动态过滤与路由权限控制
5.  移除了README中冗余的权限管理菜单项

src/Login/index.tsx

@@ -0,0 +1,68 @@
+import { useState } from 'react';
+import { Button, Form, Input, Message } from '@arco-design/web-react';
+import { IconLock, IconUser } from '@arco-design/web-react/icon';
+import { useNavigate } from 'react-router-dom';
+import type { ApiResponse } from '../api/types';
+import { API_BASE_URL, TOKEN_KEY, api } from '../api/client';
+import './index.css';
+
+function LoginPage() {
+  const navigate = useNavigate();
+  const [loading, setLoading] = useState(false);
+
+  const onSubmit = async (values: { username: string; password: string }) => {
+    setLoading(true);
+    try {
+      const response = await api.post<ApiResponse<{ accessToken: string }>>('/api/admin/v1/auth/login', values);
+      localStorage.setItem(TOKEN_KEY, response.data.data.accessToken);
+      Message.success('登录成功');
+      navigate('/dashboard', { replace: true });
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div className="login-page">
+      <div className="login-visual">
+        <div className="login-logo">
+          <span className="logo-mark">CT</span>
+          <span>cth-tk-admin</span>
+        </div>
+        <div className="login-brand">
+          <span className="login-eyebrow">TikTok 短剧运营后台</span>
+          <h1>CTH TikTok 短剧管理后台</h1>
+          <p>集中处理短剧内容、剧集发布、订单支付、播放日志和系统权限，帮助运营人员稳定管理短剧业务。</p>
+        </div>
+        <div className="login-metrics">
+          <div className="login-metric"><strong>内容</strong><span>短剧与剧集管理</span></div>
+          <div className="login-metric"><strong>权限</strong><span>角色化后台授权</span></div>
+          <div className="login-metric"><strong>日志</strong><span>请求与播放追踪</span></div>
+        </div>
+      </div>
+      <div className="login-panel">
+        <div className="login-card">
+          <div className="login-card-header">
+            <span className="login-card-mark">CT</span>
+            <div>
+              <h2>后台登录</h2>
+              <p className="subtitle">使用管理员账号进入控制台。</p>
+            </div>
+          </div>
+          <Form layout="vertical" onSubmit={onSubmit} initialValues={{ username: 'admin', password: 'admin123' }}>
+            <Form.Item label="用户名" field="username" rules={[{ required: true }]}>
+              <Input prefix={<IconUser />} placeholder="admin" />
+            </Form.Item>
+            <Form.Item label="密码" field="password" rules={[{ required: true }]}>
+              <Input.Password prefix={<IconLock />} placeholder="admin123" />
+            </Form.Item>
+            <Button type="primary" htmlType="submit" loading={loading} long>登录</Button>
+          </Form>
+          <div className="login-card-footer">API 服务：{API_BASE_URL}</div>
+        </div>
+      </div>
+    </div>
+  );
+}
+
+export default LoginPage;