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/models/table.py

@@ -13,6 +13,7 @@ class TableGroup(Base):
     color = Column(String, nullable=True)
 
     tables = relationship("Table", back_populates="group")
+    waiter_zones = relationship("WaiterZone", back_populates="group")
 
 
 class Table(Base):