品牌化重构: StreamCore + 现代UI主题 + 英文界面

- 移除所有emoji (HomePage中的🎬改为VideoCameraOutlined图标)
- 主题重设计: 深蓝色系主色(#1E3A5F),系统sans-serif字体
  白色/浅灰背景,现代卡片阴影和圆角,完全去除复古感
- 首页移除管理入口,纯观众视角(渐变横幅+卡片列表)
- 统一品牌名称 StreamCore (替换LiveStream)
- 全部界面英文(antd默认locale,去除zhCN)
- 登录页渐变+卡片居中布局

frontend/src/admin/pages/NodeManager.tsx

@@ -24,9 +24,9 @@ interface StrategyInfo {
 }
 
 const strategyLabels: Record<string, string> = {
-  'round-robin': '轮询',
-  'weighted': '权重',
-  'least-conn': '最少连接',
+  'round-robin': 'Round-Robin',
+  'weighted': 'Weighted',
+  'least-conn': 'Least-Conn',
 }
 
 export default function NodeManager() {
@@ -45,15 +45,15 @@ export default function NodeManager() {
       ])
       setNodes(nodesRes.data)
       setStrategy(strategyRes.data)
-    } catch { message.error('加载失败') }
+    } catch { message.error('Failed to load') }
     setLoading(false)
   }
 
   async function updateWeight(nodeId: string, weight: number) {
     try {
       await api.put(`/nodes/${nodeId}`, { weight })
-      message.success('已更新')
-    } catch { message.error('更新失败') }
+      message.success('Updated')
+    } catch { message.error('Failed') }
   }
 
   async function toggleNode(nodeId: string, enabled: boolean) {
@@ -62,17 +62,17 @@ export default function NodeManager() {
     try {
       await api.put(`/nodes/${nodeId}`, { weight: node.weight, enabled })
       setNodes((prev) => prev.map((n) => (n.id === nodeId ? { ...n, enabled } : n)))
-      message.success('已更新')
-    } catch { message.error('更新失败') }
+      message.success('Updated')
+    } catch { message.error('Failed') }
   }
 
   const columns = [
-    { title: '名称', dataIndex: 'name', key: 'name' },
-    { title: '主机', dataIndex: 'host', key: 'host' },
-    { title: 'HLS 端口', dataIndex: 'hls_port', key: 'hls_port', width: 100 },
-    { title: 'API 端口', dataIndex: 'api_port', key: 'api_port', width: 100 },
+    { title: 'Name', dataIndex: 'name', key: 'name' },
+    { title: 'Host', dataIndex: 'host', key: 'host' },
+    { title: 'HLS Port', dataIndex: 'hls_port', key: 'hls_port', width: 100 },
+    { title: 'API Port', dataIndex: 'api_port', key: 'api_port', width: 100 },
     {
-      title: '权重', dataIndex: 'weight', key: 'weight', width: 140,
+      title: 'Weight', dataIndex: 'weight', key: 'weight', width: 140,
       render: (_: number, record: NodeInfo) => (
         <InputNumber
           min={0}
@@ -89,7 +89,7 @@ export default function NodeManager() {
       ),
     },
     {
-      title: '启用', dataIndex: 'enabled', key: 'enabled', width: 80,
+      title: 'Enabled', dataIndex: 'enabled', key: 'enabled', width: 80,
       render: (_: any, record: NodeInfo) => (
         <Switch
           checked={record.enabled}
@@ -99,45 +99,46 @@ export default function NodeManager() {
       ),
     },
     {
-      title: '状态', key: 'health', width: 100,
-      render: () => <Tag icon={<CheckCircleOutlined />} color="success">在线</Tag>,
+      title: 'Health', key: 'health', width: 100,
+      render: () => <Tag icon={<CheckCircleOutlined />} color="success">Online</Tag>,
     },
   ]
 
   return (
     <div>
-      <Title level={3} style={{ marginBottom: 24 }}>边缘节点管理</Title>
+      <Title level={3} style={{ marginBottom: 24, fontWeight: 600 }}>Edge Nodes</Title>
 
       {strategy && (
         <Row gutter={[24, 24]} style={{ marginBottom: 24 }}>
           <Col xs={24} sm={8}>
-            <Card>
+            <Card style={{ borderRadius: 12 }}>
               <Statistic
-                title="负载均衡策略"
+                title="Strategy"
                 value={strategyLabels[strategy.strategy] || strategy.strategy}
               />
             </Card>
           </Col>
           <Col xs={24} sm={8}>
-            <Card>
+            <Card style={{ borderRadius: 12 }}>
               <Statistic
-                title="组播状态"
-                value={strategy.multicast_available ? '可用' : '不可用'}
-                valueStyle={{ color: strategy.multicast_available ? '#52c41a' : '#999' }}
+                title="Multicast"
+                value={strategy.multicast_available ? 'Available' : 'N/A'}
+                valueStyle={{ color: strategy.multicast_available ? '#2E7D32' : '#999' }}
               />
             </Card>
           </Col>
           <Col xs={24} sm={8}>
-            <Card>
-              <Statistic title="边缘节点数" value={nodes.length} />
+            <Card style={{ borderRadius: 12 }}>
+              <Statistic title="Nodes" value={nodes.length} />
             </Card>
           </Col>
         </Row>
       )}
 
       <Card
-        title="节点列表"
-        extra={<Button icon={<ReloadOutlined />} onClick={loadData}>刷新</Button>}
+        title="Node List"
+        extra={<Button icon={<ReloadOutlined />} onClick={loadData}>Refresh</Button>}
+        style={{ borderRadius: 12 }}
       >
         <Table
           dataSource={nodes}