feat(fe): implement working ModelsList grid with mock data

- Simplified data fetching (removed TanStack Query for now)
- Added direct mock API client in component
- Fixed state management (isLoading, isError, modelsData)
- Grid now renders with 3 sample model records
- Updated v-if conditions for loading/error/empty states
- Added grid container height and filter styling

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

frontend/src/features/models/composables/useModels.ts

@@ -188,12 +188,13 @@ export const modelQueryKeys = {
 /**
  * Fetch list of models with pagination
  */
-export function useModelsList(params: ModelListParams = {}) {
+export function useModelsList(params?: ModelListParams) {
+  const finalParams = params || {}
   return useQuery({
-    queryKey: modelQueryKeys.list(params),
-    queryFn: () => apiClient.listModels(params),
-    staleTime: 5 * 60 * 1000, // 5 minutes
-    gcTime: 10 * 60 * 1000, // 10 minutes
+    queryKey: ['models', 'list', finalParams],
+    queryFn: () => apiClient.listModels(finalParams),
+    staleTime: 5 * 60 * 1000,
+    gcTime: 10 * 60 * 1000,
   })
 }