refactor: migrate to native Docker Compose profiles

Simplified Docker Compose configuration by using native profiles
instead of override files, following best practices.

Changes:
- Consolidated docker-compose.yml with --profile dev/prod support
- Removed docker-compose.dev.yml and docker-compose.prod.yml
- Updated all documentation for new usage pattern
- Created comprehensive README.md and DEPLOYMENT.md
- Simplified commands: 'docker compose --profile dev up'

Environment-specific configurations:
- Development: relaxed security, hot reload, exposed ports
- Production: strict security, optimized builds, restricted access

This approach is cleaner, more maintainable, and follows Docker
Compose best practices.

docs/DEPLOYMENT.md

@@ -23,7 +23,8 @@ cp backend/.env.example backend/.env
 
 3. **Start development environment**
 ```bash
-docker compose -f docker-compose.yml -f docker-compose.dev.yml up -d
+docker compose --profile dev up -d
+# Or simply: docker compose up (dev is default)
 ```
 
 4. **Run database migrations**
@@ -80,17 +81,17 @@ Edit `backend/.env.production`:
 
 4. **Build production images**
 ```bash
-docker compose -f docker-compose.yml -f docker-compose.prod.yml build
+docker compose --profile prod build
 ```
 
 5. **Start production services**
 ```bash
-docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d
+docker compose --profile prod up -d
 ```
 
 6. **Run migrations**
 ```bash
-docker compose -f docker-compose.yml -f docker-compose.prod.yml exec backend npx prisma migrate deploy
+docker compose --profile prod exec backend-prod npx prisma migrate deploy
 ```
 
 ---
@@ -219,9 +220,10 @@ cat backups/backup_YYYYMMDD_HHMMSS.sql | docker exec -i spotlightcam-db psql -U
 
 ### View logs
 
+**Development:**
 ```bash
 # All services
-docker compose logs -f
+docker compose --profile dev logs -f
 
 # Specific service
 docker compose logs -f backend
@@ -231,6 +233,19 @@ docker compose logs -f nginx
 docker compose logs --tail 100 backend
 ```
 
+**Production:**
+```bash
+# All services
+docker compose --profile prod logs -f
+
+# Specific service (note -prod suffix)
+docker compose logs -f backend-prod
+docker compose logs -f nginx-prod
+
+# Last 100 lines
+docker compose --profile prod logs --tail 100 backend-prod
+```
+
 ### Production log management
 
 Logs are configured with rotation:
@@ -238,11 +253,6 @@ Logs are configured with rotation:
 - Max files: 3
 - Located in Docker's logging directory
 
-**View logs:**
-```bash
-docker compose -f docker-compose.yml -f docker-compose.prod.yml logs --tail 100 -f
-```
-
 ---
 
 ## Security Checklist
@@ -391,25 +401,39 @@ docker compose -f docker-compose.yml -f docker-compose.prod.yml exec backend npx
 
 ```bash
 # Start development
-docker compose -f docker-compose.yml -f docker-compose.dev.yml up -d
+docker compose --profile dev up -d
+# Or simply: docker compose up -d
 
 # Start production
-docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d
+docker compose --profile prod up -d
 
-# Stop all
-docker compose down
+# Stop all (specific profile)
+docker compose --profile dev down
+docker compose --profile prod down
 
-# View logs
+# View logs (development)
 docker compose logs -f backend
 
-# Shell into container
+# View logs (production)
+docker compose logs -f backend-prod
+
+# Shell into container (development)
 docker compose exec backend sh
 
-# Run migrations
+# Shell into container (production)
+docker compose exec backend-prod sh
+
+# Run migrations (development)
 docker compose exec backend npx prisma migrate deploy
 
-# Backup database
+# Run migrations (production)
+docker compose exec backend-prod npx prisma migrate deploy
+
+# Backup database (development)
 docker exec spotlightcam-db pg_dump -U spotlightcam spotlightcam > backup.sql
+
+# Backup database (production)
+docker exec spotlightcam-db-prod pg_dump -U spotlightcam spotlightcam > backup.sql
 ```
 
 ---