Add boxes/crates management system to warehouse module

- Created boxes_crates table with 8-digit auto-generated box numbers
- Added manage_boxes route and full CRUD operations
- Implemented box status tracking (open/closed)
- Added location assignment functionality
- Integrated QZ Tray printing with barcode labels
- Created manage_boxes.html with table, preview, and print features
- Added 'Manage Boxes/Crates' card to warehouse main page
- Boxes can be created without location and assigned later
- Includes delete functionality for admin/management roles
- Added box statistics display

py_app/app/routes.py

@@ -3940,6 +3940,13 @@ def delete_location():
         return jsonify({'success': False, 'error': str(e)})
 
 
+@warehouse_bp.route('/manage_boxes', methods=['GET', 'POST'])
+@requires_warehouse_module
+def manage_boxes():
+    from app.warehouse import manage_boxes_handler
+    return manage_boxes_handler()
+
+
 # Daily Mirror Route Redirects for Backward Compatibility
 @bp.route('/daily_mirror_main')
 def daily_mirror_main_route():