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/auth/auth.controller.ts

@@ -0,0 +1,37 @@
+import { Controller, Get, Post, Request, UseGuards } from '@nestjs/common';
+import { AuthService } from './auth.service';
+import { LocalAuthGuard } from './local-auth.guard';
+import { CombinedAuthGuard } from './combined-auth.guard';
+import { Public } from './public.decorator';
+
+@Controller('auth')
+export class AuthController {
+  constructor(private authService: AuthService) {}
+
+  @Public()
+  @UseGuards(LocalAuthGuard)
+  @Post('login')
+  async login(@Request() req) {
+    return this.authService.login(req.user);
+  }
+
+  @UseGuards(CombinedAuthGuard)
+  @Get('profile')
+  getProfile(@Request() req) {
+    return req.user;
+  }
+
+  @UseGuards(CombinedAuthGuard)
+  @Get('api-key')
+  async getApiKey(@Request() req) {
+    const apiKey = await this.authService.getOrCreateApiKey(req.user.id);
+    return { apiKey };
+  }
+
+  @UseGuards(CombinedAuthGuard)
+  @Post('api-key/regenerate')
+  async regenerateApiKey(@Request() req) {
+    const apiKey = await this.authService.regenerateApiKey(req.user.id);
+    return { apiKey };
+  }
+}