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>

ENV_TEMPLATE.txt

@@ -0,0 +1,28 @@
+# Environment Variables Template
+# Copy this file to .env and fill in your values
+# DO NOT commit .env to version control
+
+# Django Settings
+SECRET_KEY=your-secret-key-here-change-in-production
+# Generate a secret key with: python -c "from django.core.management.utils import get_random_secret_key; print(get_random_secret_key())"
+DEBUG=False
+ALLOWED_HOSTS=localhost,127.0.0.1,185.208.172.158
+
+# Database Configuration
+POSTGRES_DB=Zoneco_ORG
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=postgres
+POSTGRES_HOST=db
+POSTGRES_PORT=5432
+DATABASE_URL=postgresql://postgres:postgres@db:5432/Zoneco_ORG
+
+# Django Port
+DJANGO_PORT=8000
+
+# CORS Settings (comma-separated)
+CORS_ALLOWED_ORIGINS=http://localhost:5173,http://localhost:3000,http://127.0.0.1:5173,http://127.0.0.1:3000,http://185.208.172.158:9123,http://185.208.172.158
+
+# Gunicorn Settings (optional)
+GUNICORN_WORKERS=3
+GUNICORN_TIMEOUT=120
+