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

server/src/model-config/model-config.controller.ts

@@ -0,0 +1,80 @@
+// server/src/model-config/model-config.controller.ts
+import {
+  Body,
+  Controller,
+  Delete,
+  Get,
+  HttpCode,
+  HttpStatus,
+  Param,
+  Patch,
+  Post,
+  Put,
+  Req,
+  UseGuards,
+} from '@nestjs/common';
+import { ModelConfigService } from './model-config.service';
+import { CreateModelConfigDto } from './dto/create-model-config.dto';
+import { UpdateModelConfigDto } from './dto/update-model-config.dto';
+import { CombinedAuthGuard } from '../auth/combined-auth.guard';
+import { RolesGuard } from '../auth/roles.guard';
+import { Roles } from '../auth/roles.decorator';
+import { UserRole } from '../user/user-role.enum';
+import { ModelConfigResponseDto } from './dto/model-config-response.dto';
+import { plainToClass } from 'class-transformer';
+
+@UseGuards(CombinedAuthGuard)
+@Controller('models') // Global prefix /api/models
+export class ModelConfigController {
+  constructor(private readonly modelConfigService: ModelConfigService) {}
+
+  @Roles(UserRole.TENANT_ADMIN, UserRole.SUPER_ADMIN)
+  @Post()
+  @HttpCode(HttpStatus.CREATED)
+  async create(
+    @Body() createModelConfigDto: CreateModelConfigDto,
+  ): Promise<ModelConfigResponseDto> {
+    const modelConfig =
+      await this.modelConfigService.create(createModelConfigDto);
+    return plainToClass(ModelConfigResponseDto, modelConfig);
+  }
+
+  @Get()
+  async findAll(): Promise<ModelConfigResponseDto[]> {
+    const modelConfigs = await this.modelConfigService.findAll();
+    return modelConfigs.map((mc) => plainToClass(ModelConfigResponseDto, mc));
+  }
+
+  @Get(':id')
+  async findOne(@Param('id') id: string): Promise<ModelConfigResponseDto> {
+    const modelConfig = await this.modelConfigService.findOne(id);
+    return plainToClass(ModelConfigResponseDto, modelConfig);
+  }
+
+  @Roles(UserRole.TENANT_ADMIN, UserRole.SUPER_ADMIN)
+  @Put(':id')
+  async update(
+    @Param('id') id: string,
+    @Body() updateModelConfigDto: UpdateModelConfigDto,
+  ): Promise<ModelConfigResponseDto> {
+    const modelConfig = await this.modelConfigService.update(
+      id,
+      updateModelConfigDto,
+    );
+    return plainToClass(ModelConfigResponseDto, modelConfig);
+  }
+
+  @Roles(UserRole.TENANT_ADMIN, UserRole.SUPER_ADMIN)
+  @Delete(':id')
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async remove(@Param('id') id: string): Promise<void> {
+    await this.modelConfigService.remove(id);
+  }
+
+  @Roles(UserRole.TENANT_ADMIN, UserRole.SUPER_ADMIN)
+  @Patch(':id/set-default')
+  async setDefault(@Param('id') id: string): Promise<ModelConfigResponseDto> {
+    const modelConfig = await this.modelConfigService.setDefault(id);
+    return plainToClass(ModelConfigResponseDto, modelConfig);
+  }
+}