Feat: Add agent page. #3221 (#5179)

### What problem does this PR solve?

Feat: Add agent page. #3221

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/layouts/next-header.tsx

@@ -33,7 +33,7 @@ export function Header() {
       { path: Routes.Datasets, name: t('knowledgeBase'), icon: Library },
       { path: Routes.Chats, name: t('chat'), icon: MessageSquareText },
       { path: Routes.Search, name: t('search'), icon: Search },
-      { path: Routes.Agent, name: t('flow'), icon: Cpu },
+      { path: Routes.Agents, name: t('flow'), icon: Cpu },
       { path: Routes.Files, name: t('fileManager'), icon: File },
     ],
     [t],