refactor: update knowledge document types and API client interfaces

- Refactored types in `Knowledge/types.ts` to introduce new interfaces for document handling.
- Added `KnowledgeDocItem`, `KnowledgeDocsListResponse`, `KnowledgeDocsUploadInput`, `KnowledgeDocsUploadResponse`, and `KnowledgeDocsDeleteResponse` for better structure and clarity.
- Updated `KnowledgeDocsApiClient` interface to include methods for listing, uploading, and deleting documents.

fix: replace deprecated icons in AccountSettingsPanel and SettingMenu

- Replaced `CheckCircleIcon` with `CheckCircle` from `lucide-react` in `AccountSettingsPanel.tsx`.
- Updated `SettingMenu.tsx` to use `Settings` and `User` from `lucide-react` instead of custom icons.

test: add tests for knowledge docs routes and KnowledgePage

- Created `knowledge-docs-routes.test.ts` to test API routes for listing, uploading, and deleting knowledge documents.
- Added `knowledge-page.test.tsx` to test the rendering and functionality of the KnowledgePage component, including document loading and deletion.

electron/api/router.ts

@@ -9,6 +9,7 @@ import { handleChannelRoutes } from './routes/channels';
 import { handleCronRoutes } from './routes/cron';
 import { handleFileRoutes } from './routes/files';
 import { handleGatewayRoutes } from './routes/gateway';
+import { handleKnowledgeRoutes } from './routes/knowledge';
 import { handleModelRoutes } from './routes/models';
 import { handleProviderRoutes } from './routes/providers';
 import { handleSessionRoutes } from './routes/sessions';
@@ -25,6 +26,7 @@ const routeHandlers: RouteHandler[] = [
   handleModelRoutes,
   handleCronRoutes,
   handleGatewayRoutes,
+  handleKnowledgeRoutes,
   handleFileRoutes,
   handleSessionRoutes,
 ];