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/podcasts/podcast.controller.ts

@@ -0,0 +1,52 @@
+import {
+  Controller,
+  Get,
+  Post,
+  Body,
+  Param,
+  Delete,
+  UseGuards,
+  Req,
+  Query,
+  Res,
+} from '@nestjs/common';
+import { CombinedAuthGuard } from '../auth/combined-auth.guard';
+import { PodcastService } from './podcast.service';
+import { Response } from 'express';
+import * as path from 'path';
+
+@Controller('podcasts')
+export class PodcastController {
+  constructor(private readonly podcastService: PodcastService) {}
+
+  @Post()
+  @UseGuards(CombinedAuthGuard)
+  create(@Req() req, @Body() createDto: any) {
+    return this.podcastService.create(req.user.id, createDto);
+  }
+
+  @Get()
+  @UseGuards(CombinedAuthGuard)
+  findAll(@Req() req, @Query('groupId') groupId?: string) {
+    return this.podcastService.findAll(req.user.id, groupId);
+  }
+
+  @Get(':id')
+  @UseGuards(CombinedAuthGuard)
+  findOne(@Req() req, @Param('id') id: string) {
+    return this.podcastService.findOne(req.user.id, id);
+  }
+
+  @Delete(':id')
+  @UseGuards(CombinedAuthGuard)
+  remove(@Req() req, @Param('id') id: string) {
+    return this.podcastService.delete(req.user.id, id);
+  }
+
+  // Public route for audio streaming (or protected if preferred)
+  @Get('audio/:filename')
+  async streamAudio(@Param('filename') filename: string, @Res() res: Response) {
+    const filePath = path.join(process.cwd(), 'uploads', 'podcasts', filename);
+    res.sendFile(filePath);
+  }
+}