fix: Add JWT auth guard to photos controller

The photos upload endpoint was missing authentication, causing 500 errors.
Added @UseGuards(JwtAuthGuard) to protect all photo endpoints and ensure
req.user is populated for photo operations.

Fixes photo upload authentication issue.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

maternal-app/maternal-app-backend/src/modules/photos/photos.controller.ts

@@ -11,12 +11,15 @@ import {
   UseInterceptors,
   UploadedFile,
   BadRequestException,
+  UseGuards,
 } from '@nestjs/common';
 import { FileInterceptor } from '@nestjs/platform-express';
 import { PhotosService } from './photos.service';
 import { PhotoType } from '../../database/entities/photo.entity';
+import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
 
 @Controller('api/v1/photos')
+@UseGuards(JwtAuthGuard)
 export class PhotosController {
   constructor(private readonly photosService: PhotosService) {}