Add Django application with PyGento integration

[Copilot]

Implements Django web application demonstrating direct Magento database access via PyGento ORM.

Implementation

Django App Structure

• products/ app with class-based views for Magento catalog queries
• Three endpoints: home documentation (/), product listing (/products/), health check (/health/)
• Dual-format responses: HTML templates + JSON API (?format=json)
• Query parameter: limit (1-100, default 10) with validation

PyGento Integration

from models import init_db
from models.catalog import CatalogProductEntity as Product
from utils.database import DatabaseConnection

# Initialize connection using existing .env config
db_conn = DatabaseConnection()
engine, Session = init_db(db_conn.get_connection_string())
session = Session()

# Direct SQLAlchemy queries
products = session.query(Product).limit(limit).all()

Security & Error Handling

• SECRET_KEY from environment variable with development fallback
• Input validation with bounds checking on query parameters
• Database connection errors return 500 with user-facing error messages
• Session cleanup in finally blocks

Templates

• Responsive UI with gradient styling, stats cards, product tables
• Error state rendering when database unavailable
• Base template for consistent layout

Testing

• Test suite covering views, validation, both formats (HTML/JSON)
• Handles missing database gracefully in tests

Documentation

• Updated README with Django quick start
• DJANGO_APP.md with API reference, deployment guide, troubleshooting
• run_django.py convenience script with startup banner

Configuration

Reuses existing PyGento .env configuration:

• Database credentials (DB_HOST, DB_PORT, DB_NAME, DB_USER, DB_PASSWORD)
• MAGENTO_EDITION (community/enterprise)
• Optional DJANGO_SECRET_KEY for production

Code Quality

• 473 LOC across 16 Python files + 3 templates
• CodeQL: 0 vulnerabilities
• .gitignore excludes __pycache__, db.sqlite3, etc.

Original prompt

Write jango app using PyGento

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