Major updates: Setup environment, database, permissions and admin access

- Created virtual environment and installed requirements
- Set up MariaDB database with user 'sa' and database 'recticel'
- Created order_for_labels table for printing functionality
- Implemented role-based permissions system with admin role
- Added admin access to print label modules and etichete functionality
- Fixed template routing issues in main_page_etichete.html
- Updated app to run on port 8781 with network access (0.0.0.0)
- Added systemd service file for background deployment
- Created installation documentation

py_app/run.py

@@ -3,4 +3,4 @@ from app import create_app
 app = create_app()
 
 if __name__ == '__main__':
-    app.run(debug=True)
+    app.run(debug=True, port=8781, host='0.0.0.0')