feat: add models management and usage history components

- Introduced RequestContentDialog for displaying request content details.
- Added UsageBarChart for visualizing token usage data.
- Implemented UsageHistorySection to manage and display usage history with filtering and pagination.
- Created provider-types for managing provider-related types.
- Developed ModelsPage to encapsulate models configuration, providers, and usage history.
- Defined usage-history types and utility functions for managing usage data.
- Updated routing to include models page and redirect agents to models.
- Refactored chat store to integrate models instead of agents.
- Established models store for managing model-related state and data fetching.

electron/api/router.ts

@@ -4,9 +4,9 @@ import { providerApiService } from '@electron/service/provider-api-service';
 import type { HostApiContext } from './context';
 import type { HostApiRequest } from './route-utils';
 import { normalizeRequest } from './route-utils';
-import { handleAgentRoutes } from './routes/agents';
 import { handleFileRoutes } from './routes/files';
 import { handleGatewayRoutes } from './routes/gateway';
+import { handleModelRoutes } from './routes/models';
 import { handleProviderRoutes } from './routes/providers';
 import { handleSessionRoutes } from './routes/sessions';
 
@@ -17,7 +17,7 @@ type RouteHandler = (
 
 const routeHandlers: RouteHandler[] = [
   handleProviderRoutes,
-  handleAgentRoutes,
+  handleModelRoutes,
   handleGatewayRoutes,
   handleFileRoutes,
   handleSessionRoutes,