feat: initial commit — local services (backend + manager dashboard + waiter PWA)

Includes all work to date:
- local_backend: FastAPI backend with products, orders, tables, shifts, cloud sync
- manager_dashboard: React manager UI with product/category management, reports, settings
- waiter_pwa: React PWA for waiter devices
- Category reparent endpoint and UI
- Waiter domain: local_ip sent on heartbeat, waiter_domain persisted from cloud response
- QR code modal in AppInfoTab for waiter domain
- Product form: number input spinners removed, category pre-selected on new product
- Category row: count badge moved to far right

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

local_backend/models/flag.py

@@ -0,0 +1,38 @@
+from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, Boolean
+from sqlalchemy.orm import relationship
+from datetime import datetime, timezone
+from database import Base
+
+
+def _utcnow():
+    return datetime.now(timezone.utc)
+
+
+class TableFlagDef(Base):
+    """Manager-configurable flag definitions (name, emoji, color)."""
+    __tablename__ = "table_flag_defs"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, nullable=False)
+    emoji = Column(String, nullable=True)
+    color = Column(String, nullable=True, default="#6b7280")  # hex background
+    text_color = Column(String, nullable=True, default=None)  # hex text; None = white
+    sort_order = Column(Integer, default=0, nullable=False)
+    is_active = Column(Boolean, default=True, nullable=False)
+    created_at = Column(DateTime(timezone=True), default=_utcnow)
+
+    assignments = relationship("TableFlagAssignment", back_populates="flag_def", cascade="all, delete-orphan")
+
+
+class TableFlagAssignment(Base):
+    """Active flag on a specific table."""
+    __tablename__ = "table_flag_assignments"
+
+    id = Column(Integer, primary_key=True, index=True)
+    table_id = Column(Integer, ForeignKey("tables.id"), nullable=False)
+    flag_id = Column(Integer, ForeignKey("table_flag_defs.id"), nullable=False)
+    assigned_at = Column(DateTime(timezone=True), default=_utcnow)
+    assigned_by = Column(Integer, ForeignKey("users.id"), nullable=True)
+
+    flag_def = relationship("TableFlagDef", back_populates="assignments")
+    assigned_by_user = relationship("User")