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/schemas/user.py

@@ -0,0 +1,61 @@
+from pydantic import BaseModel
+from datetime import datetime
+from typing import Optional, List
+from schemas.base import UTCDatetime
+
+
+class UserBase(BaseModel):
+    username: str
+    role: str
+    is_active: bool = True
+    full_name: Optional[str] = None
+    nickname: Optional[str] = None
+    mobile_phone: Optional[str] = None
+    avatar_url: Optional[str] = None
+    email: Optional[str] = None
+
+
+class UserCreate(UserBase):
+    pin: str
+
+
+class UserUpdate(BaseModel):
+    username: Optional[str] = None
+    role: Optional[str] = None
+    is_active: Optional[bool] = None
+    full_name: Optional[str] = None
+    nickname: Optional[str] = None
+    mobile_phone: Optional[str] = None
+
+
+class WaiterZoneOut(BaseModel):
+    id: int
+    waiter_id: int
+    group_id: Optional[int] = None   # None = all zones
+
+    model_config = {"from_attributes": True}
+
+
+class UserOut(UserBase):
+    id: int
+    created_at: UTCDatetime
+    zone_assignments: List[WaiterZoneOut] = []
+
+    model_config = {"from_attributes": True}
+
+
+class SetZonesRequest(BaseModel):
+    """Replace all zone assignments for a waiter in one call.
+    group_ids=[] means remove all (sees nothing).
+    group_ids=[null] or all_zones=True means the wildcard 'all zones' sentinel."""
+    group_ids: Optional[List[Optional[int]]] = None  # list of group ids; None in list = all-zones sentinel
+    all_zones: bool = False  # convenience flag: if True, set a single NULL-group_id row
+
+
+class AssistantAssignmentOut(BaseModel):
+    id: int
+    primary_waiter_id: int
+    assistant_waiter_id: int
+    assigned_at: UTCDatetime
+
+    model_config = {"from_attributes": True}