feat: 首页添加性能监控

src/App.js

@@ -31,6 +31,7 @@ import { initializePostHog } from './store/slices/posthogSlice';
 
 // Utils
 import { logger } from './utils/logger';
+import { performanceMonitor } from './utils/performanceMonitor';
 
 // PostHog 追踪
 import { trackEvent, trackEventAsync } from '@lib/posthog';
@@ -57,6 +58,11 @@ function AppContent() {
         logger.info('App', 'PostHog Redux 初始化已触发');
     }, [dispatch]);
 
+    // ⚡ 性能监控：标记 React 初始化完成
+    useEffect(() => {
+        performanceMonitor.mark('react-ready');
+    }, []);
+
     // ✅ 首次访问追踪
     useEffect(() => {
         const hasVisited = localStorage.getItem('has_visited');

src/index.js

@@ -3,6 +3,10 @@ import React from 'react';
 import ReactDOM from 'react-dom/client';
 import { BrowserRouter as Router } from 'react-router-dom';
 
+// ⚡ 性能监控：在应用启动时尽早标记
+import { performanceMonitor } from './utils/performanceMonitor';
+performanceMonitor.mark('app-start');
+
 // 导入 Brainwave 样式（空文件，保留以避免错误）
 import './styles/brainwave.css';