全局整改: 布局重构、鉴权加固、API修复

- 首页/播放页: 去掉 antd Layout 改用 div 避免 flex 布局问题
- 播放页: 返回按钮改为 navigate('/') 替代 window.close()
- 后端登录/验证: 改用 POST JSON body 替代 query param
- 后端鉴权: require_auth 依赖注入保护所有管理接口
- nodes路由: 修复 /strategy 被 /{node_id} 拦截的顺序问题
- 前端 Settings: 策略更新改为 JSON body

frontend/src/viewer/pages/HomePage.tsx

@@ -1,12 +1,11 @@
 import { useState, useEffect } from 'react'
 import { useNavigate } from 'react-router-dom'
 import {
-  Layout, Row, Col, Card, Typography, Tag, Button, Skeleton, Empty, Space,
+  Row, Col, Card, Typography, Tag, Button, Skeleton, Empty, Space,
 } from 'antd'
 import { LoginOutlined, FireOutlined, ClockCircleOutlined } from '@ant-design/icons'
 import { fetchStreams, type StreamInfo } from '../../api/streams'
 
-const { Header, Content } = Layout
 const { Title, Text } = Typography
 
 const statusMeta: Record<string, { color: string; label: string; icon: React.ReactNode }> = {
@@ -34,8 +33,8 @@ export default function HomePage() {
   })
 
   return (
-    <Layout style={{ minHeight: '100vh', background: '#FAF8F5' }}>
-      <Header style={{
+    <div style={{ minHeight: '100vh', background: '#FAF8F5' }}>
+      <div style={{
         background: '#FFFFFF',
         borderBottom: '1px solid #E8E4DD',
         display: 'flex',
@@ -57,13 +56,13 @@ export default function HomePage() {
         >
           管理后台
         </Button>
-      </Header>
-      <Content style={{ padding: '32px 48px', maxWidth: 1280, margin: '0 auto' }}>
+      </div>
+      <div style={{ maxWidth: 1280, margin: '0 auto', padding: '32px 48px' }}>
         <Title level={3} style={{ marginBottom: 24 }}>全部直播</Title>
 
         {loading ? (
           <Row gutter={[24, 24]}>
-            {[1,2,3,4,5,6].map((i) => (
+            {[1, 2, 3, 4, 5, 6].map((i) => (
               <Col key={i} xs={24} sm={12} md={8} lg={8}>
                 <Card><Skeleton active /></Card>
               </Col>
@@ -120,7 +119,7 @@ export default function HomePage() {
             })}
           </Row>
         )}
-      </Content>
-    </Layout>
+      </div>
+    </div>
   )
 }