修复HTTPS环境下WebSocket连接被拦截的问题

- WebSocket URL 根据页面协议自动选择 ws/wss
- 使用 window.location.host 替代硬编码端口，适配内网穿透代理场景

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

web/frontend/src/pages/LoginTasksPage.tsx

@@ -139,7 +139,7 @@ export default function LoginTasksPage() {
       message.success(`已创建登录任务，共 ${result.count} 个账号`);
 
       // 连接 WebSocket
-      const wsUrl = `ws://${window.location.hostname}:8000/api/login/ws/login/${result.batch_id}`;
+      const wsUrl = `${window.location.protocol === 'https:' ? 'wss' : 'ws'}://${window.location.host}/api/login/ws/login/${result.batch_id}`;
       const ws = new WebSocket(wsUrl);
       wsRef.current = ws;
       setWsConnected(true);

web/frontend/src/pages/ProxyPage.tsx

@@ -2,7 +2,7 @@ import { useEffect, useState, useRef } from 'react';
 import { Form, Input, Switch, Button, Card, message, Row, Col, theme } from 'antd';
 import { proxyApi } from '../api/modules';
 
-const WS_BASE = `ws://${window.location.hostname}:8000`;
+const WS_BASE = `${window.location.protocol === 'https:' ? 'wss' : 'ws'}://${window.location.host}`;
 
 export default function ProxyPage() {
   const { token } = theme.useToken();