feat: 管理端网站监控，浏览量写入独立 monitor.db

请求日志按日 JSONL；page_views 不进主库，避免统计数据撑大 jiang13.db。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/hooks/useMonitorPageview.ts

@@ -0,0 +1,41 @@
+import { useEffect, useRef } from 'react';
+import { useLocation } from 'react-router-dom';
+import { api } from '../api/client';
+import { useForumLimits } from './useForumLimits';
+
+const DEDUPE_MS = 800;
+
+function shouldSkipPath(pathname: string) {
+  const p = pathname.toLowerCase();
+  return (
+    p === '/admin' ||
+    p.startsWith('/admin/') ||
+    p === '/login' ||
+    p === '/register' ||
+    p === '/forgot-password' ||
+    p.startsWith('/oauth')
+  );
+}
+
+/** 主站布局：路由变化时上报第一方 pageview（采集关闭则不请求） */
+export function useMonitorPageview() {
+  const loc = useLocation();
+  const { limits } = useForumLimits();
+  const lastRef = useRef<{ key: string; at: number }>({ key: '', at: 0 });
+  const enabled = !!limits.monitor_pageview;
+
+  useEffect(() => {
+    if (!enabled) return;
+    if (shouldSkipPath(loc.pathname)) return;
+
+    const path = `${loc.pathname}${loc.search || ''}`;
+    const now = Date.now();
+    if (lastRef.current.key === path && now - lastRef.current.at < DEDUPE_MS) {
+      return;
+    }
+    lastRef.current = { key: path, at: now };
+
+    const referrer = typeof document !== 'undefined' ? document.referrer || '' : '';
+    void api.monitorPageview({ path, referrer });
+  }, [enabled, loc.pathname, loc.search]);
+}