Overhaul of the frontend on waiters, orders, and payment events

Manager Dashboard: product reorder/bulk actions, preference sub-choices
UI, expanded reports with DateInput component, waiter management updates,
order detail improvements, Docker config and backend dockerignore added.

Backend: table groups, auto-numbering, has_active_order flag, expanded
reporting endpoints, waiter zone management, user schema updates, system
router additions, table router fixes.

Waiter PWA: TableDetailPage order/payment event improvements.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

local_backend/routers/system.py

@@ -38,6 +38,11 @@ def system_status(db: Session = Depends(get_db), user: User = Depends(get_curren
     }
 
 
+@router.get("/printers", response_model=List[PrinterOut])
+def list_printers(db: Session = Depends(get_db), user: User = Depends(require_manager)):
+    return db.query(Printer).filter(Printer.is_active == True).all()
+
+
 @router.post("/printers/test")
 def test_printer(printer_id: int, db: Session = Depends(get_db), user: User = Depends(require_manager)):
     printer = db.query(Printer).filter(Printer.id == printer_id).first()