Add multi-image compositions, docker setup, tests, and docs

- Add CompositionImage model with multi-image upload and main image flag
- Add composition endpoints: add-images, set-main-image, delete image, by-created-at filter
- Make contact-us by_category public
- Add 24 API tests covering all endpoints
- Add Dockerfile, docker-compose, entrypoint and docker docs
- Add Persian API docs and update README and Postman collection

Co-authored-by: Cursor <cursoragent@cursor.com>

.dockerignore

@@ -0,0 +1,74 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Virtual environments
+venv/
+env/
+ENV/
+.venv
+
+# Django
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+/media
+/staticfiles
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# Git
+.git/
+.gitignore
+
+# Docker
+Dockerfile
+docker-compose.yml
+.dockerignore
+
+# Environment
+.env
+.env.local
+.env.*.local
+
+# Testing
+.coverage
+htmlcov/
+.pytest_cache/
+.tox/
+
+# Documentation
+*.md
+!README.md
+
+# Postman
+*.postman_collection.json
+
+# OS
+Thumbs.db
+