feat: add knowledge management pages

frontend/src/app/router.tsx

@@ -1,6 +1,9 @@
 import * as React from 'react'
 
 import { DesignSystemPreview } from '@/features/design-system/DesignSystemPreview'
+import { KnowledgeBaseListPage } from '@/features/knowledge/KnowledgeBaseListPage'
+import { KnowledgeItemEditorPage } from '@/features/knowledge/KnowledgeItemEditorPage'
+import { KnowledgeSearchPage } from '@/features/knowledge/KnowledgeSearchPage'
 import { SolutionCreatePage } from '@/features/solutions/SolutionCreatePage'
 import { SolutionListPage } from '@/features/solutions/SolutionListPage'
 import { AuditLogPage } from '@/features/system/AuditLogPage'
@@ -54,6 +57,18 @@ export function Router() {
     return <WorkbenchPage />
   }
 
+  if (route === '/knowledge') {
+    return <KnowledgeBaseListPage />
+  }
+
+  if (route === '/knowledge/search') {
+    return <KnowledgeSearchPage />
+  }
+
+  if (route === '/knowledge/items/new') {
+    return <KnowledgeItemEditorPage />
+  }
+
   if (route === '/solutions') {
     return <SolutionListPage />
   }