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);