feat: Django backend foundation - project structure, dependencies, and documentation

- Created Django 4.2 project with production-ready architecture
- Installed 60+ packages including django-ninja, celery, channels, etc.
- Set up app structure (core, entities, moderation, users, versioning, media, notifications)
- Created comprehensive MIGRATION_PLAN.md with 12-phase roadmap
- Created README.md with setup instructions
- Created .env.example with all required configuration
- Configured for Python 3.13 compatibility
- All dependencies successfully installed and tested

Next steps: Configure Django settings and create base models

django/requirements/production.txt

@@ -0,0 +1,11 @@
+-r base.txt
+
+# Production Web Server
+gunicorn==21.2.0
+whitenoise==6.6.0
+
+# Production monitoring
+django-prometheus==2.3.1
+
+# Security
+cryptography==41.0.7