feat: add plugin extension pages (iframe rendering, Page SDK, security hardening, i18n)

Co-Authored-By: Typer_Body <mcjiekejiemi@163.com>

web/src/app/home/layout.tsx

@@ -44,7 +44,12 @@ import {
 } from '@/app/home/plugins/components/plugin-install-task';
 
 // Routes that belong to the "Extensions" section
-const EXTENSIONS_ROUTES = ['/home/plugins', '/home/market', '/home/mcp'];
+const EXTENSIONS_ROUTES = [
+  '/home/plugins',
+  '/home/market',
+  '/home/mcp',
+  '/home/plugin-pages',
+];
 
 function isExtensionsRoute(pathname: string): boolean {
   return EXTENSIONS_ROUTES.some(