✅ Replaced manual API documentation with Flask-RESTX OpenAPI generation
✅ All endpoints now auto-generate Swagger UI at /api/docs/
✅ Maintained backward compatibility - all existing API functionality preserved
✅ Added comprehensive OpenAPI models for request/response validation
Changes:
- app/blueprints/api/api_routes.py: Migrated from Flask routes to Flask-RESTX Resource classes
- app/blueprints/api/models.py: Created OpenAPI schema definitions
- app/extensions.py: Added Flask-RESTX configuration with API key security
- pyproject.toml: Added flask-restx>=1.3.0 dependency
- README.md: Updated API documentation to point to interactive Swagger UI
- docs/API.md: Simplified to quick-start guide pointing to automatic docs
