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>

entrypoint.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+set -e
+
+echo "Waiting for PostgreSQL to be ready..."
+while ! pg_isready -h db -U ${POSTGRES_USER:-postgres} -d ${POSTGRES_DB:-Zoneco_ORG}; do
+  echo "PostgreSQL is unavailable - sleeping"
+  sleep 1
+done
+
+echo "PostgreSQL is up - executing command"
+
+# Collect static files
+echo "Collecting static files..."
+python manage.py collectstatic --noinput
+
+# Run migrations
+echo "Running migrations..."
+python manage.py migrate --noinput
+
+# Create superuser if it doesn't exist (optional, can be removed in production)
+# Uncomment and modify if needed:
+# echo "from django.contrib.auth import get_user_model; User = get_user_model(); User.objects.filter(username='admin').exists() or User.objects.create_superuser('admin', 'admin@example.com', 'admin')" | python manage.py shell
+
+echo "Starting application..."
+exec "$@"
+