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

recticel-app.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=Recticel Quality App
+After=network.target mariadb.service
+
+[Service]
+Type=simple
+User=ske087
+WorkingDirectory=/home/ske087/quality_recticel
+Environment=PATH=/home/ske087/quality_recticel/recticel/bin
+ExecStart=/home/ske087/quality_recticel/recticel/bin/python py_app/run.py
+Restart=always
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target