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>

docker-compose.yml

@@ -0,0 +1,59 @@
+version: '3.8'
+
+services:
+  db:
+    image: postgres:15-alpine
+    container_name: zonco_db
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB:-Zoneco_ORG}
+      POSTGRES_USER: ${POSTGRES_USER:-postgres}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-postgres}
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    ports:
+      - "${POSTGRES_PORT:-5432}:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-postgres}"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    networks:
+      - zonco_network
+
+  web:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: zonco_backend
+    restart: unless-stopped
+    command: gunicorn zonco_backend.wsgi:application --bind 0.0.0.0:8000 --workers 3 --timeout 120
+    volumes:
+      - ./media:/app/media
+      - ./staticfiles:/app/staticfiles
+    ports:
+      - "${DJANGO_PORT:-8000}:8000"
+    env_file:
+      - .env
+    environment:
+      - DATABASE_URL=postgresql://${POSTGRES_USER:-postgres}:${POSTGRES_PASSWORD:-postgres}@db:5432/${POSTGRES_DB:-Zoneco_ORG}
+    depends_on:
+      db:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:8000/api/')"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+    networks:
+      - zonco_network
+
+volumes:
+  postgres_data:
+    driver: local
+
+networks:
+  zonco_network:
+    driver: bridge
+