feat: implement QuestionBank CRUD with pagination and template query

- Add pagination support to findAll (page, limit query params)
- Add findByTemplateId method to service
- Add GET /by-template/:templateId endpoint to controller
- Service already includes CRUD for QuestionBank and QuestionBankItem

web/services/modelConfigService.ts

@@ -0,0 +1,82 @@
+import { apiClient } from './apiClient';
+import { ModelConfig } from '../types'; // Frontend ModelConfig interface
+
+interface ModelConfigResponse extends Omit<ModelConfig, 'apiKey'> {
+  // Backend response might omit apiKey for security
+  id: string; // Ensure id is always present
+  createdAt: Date;
+  updatedAt: Date;
+}
+
+export const modelConfigService = {
+  async getAll(token: string): Promise<ModelConfigResponse[]> {
+    const response = await apiClient.request('/models', {
+      method: 'GET',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    });
+    if (!response.ok) {
+      const errorData = await response.json();
+      throw new Error(errorData.message || 'Failed to fetch model configs');
+    }
+    return response.json();
+  },
+
+  async create(token: string, modelConfig: Omit<ModelConfig, 'id'>): Promise<ModelConfigResponse> {
+    const response = await apiClient.request('/models', {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify(modelConfig),
+    });
+    if (!response.ok) {
+      const errorData = await response.json();
+      throw new Error(errorData.message || 'Failed to create model config');
+    }
+    return response.json();
+  },
+
+  async update(token: string, id: string, modelConfig: Partial<Omit<ModelConfig, 'id'>>): Promise<ModelConfigResponse> {
+    const response = await apiClient.request(`/models/${id}`, {
+      method: 'PUT',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify(modelConfig),
+    });
+    if (!response.ok) {
+      const errorData = await response.json();
+      throw new Error(errorData.message || 'Failed to update model config');
+    }
+    return response.json();
+  },
+
+  async remove(token: string, id: string): Promise<void> {
+    const response = await apiClient.request(`/models/${id}`, {
+      method: 'DELETE',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    });
+    if (!response.ok) {
+      const errorData = await response.json();
+      throw new Error(errorData.message || 'Failed to delete model config');
+    }
+  },
+
+  async setDefault(token: string, id: string): Promise<ModelConfigResponse> {
+    const response = await apiClient.request(`/models/${id}/set-default`, {
+      method: 'PATCH',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    });
+    if (!response.ok) {
+      const errorData = await response.json();
+      throw new Error(errorData.message || 'Failed to set default model');
+    }
+    return response.json();
+  },
+};