Add Docker deployment configuration

- Add Dockerfile for production (multi-stage build)
- Add Dockerfile.dev for development with hot reload
- Add docker-compose.yml with 5 services (web, mariadb, redis, celery-worker, celery-beat)
- Add docker-compose.dev.yml for development overrides
- Add .dockerignore for optimized builds
- Add docker/entrypoint.sh startup script
- Add .env.docker.example template
- Add Makefile for common commands
- Add deploy.sh for one-command deployment
- Update config/settings/selfhosted.py to support MariaDB via DATABASE_URL
- Add mysqlclient to requirements.txt for MariaDB support
- Update .gitignore to exclude .env.docker

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

requirements.txt

@@ -9,8 +9,9 @@ djangorestframework>=3.14.0
 djangorestframework-simplejwt>=5.3.0
 
 # Database
-psycopg2-binary>=2.9.9
-dj-database-url>=2.1.0
+psycopg2-binary>=2.9.9  # PostgreSQL driver
+mysqlclient>=2.2.0      # MariaDB/MySQL driver
+dj-database-url>=2.1.0  # Universal database URL parser
 
 # Task queue
 celery>=5.3.0