feat(local_backend): reservations, print analytics, workday summary, zone-PIN management

- New reservations module: model, schema, router (CRUD + status updates + upcoming alerts)
  and background task for auto-expiring stale reservations
- Reports: print_products, print_categories, print_tables analytics endpoints
  plus meta_products and business_day_summary for workday close/view flow
- printer_service: configurable font sizes/weights, donut/bar chart print layout helpers,
  analytics print blocks per printer
- tables/schemas: surfaced color, zone, and other new fields on Table, Product, User, Printer
- demo_seed.py for quick dev DB population; wipe_database.py utility

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

local_backend/schemas/reservation.py

@@ -0,0 +1,93 @@
+from pydantic import BaseModel, field_validator
+from typing import Optional
+from datetime import datetime, timezone
+
+
+class ReservationCreate(BaseModel):
+    guest_name: str
+    party_size: int
+    phone: Optional[str] = None
+    email: Optional[str] = None
+    note: Optional[str] = None
+    reserved_for: datetime
+    table_id: Optional[int] = None
+    source: str = "manager_app"
+    online_customer_id: Optional[str] = None
+
+    @field_validator("reserved_for", mode="before")
+    @classmethod
+    def strip_timezone(cls, v):
+        if isinstance(v, str):
+            dt = datetime.fromisoformat(v.replace("Z", "+00:00"))
+        elif isinstance(v, datetime):
+            dt = v
+        else:
+            return v
+        # Store as naive local — strip any tz info so SQLite keeps it as-is
+        if dt.tzinfo is not None:
+            dt = dt.astimezone().replace(tzinfo=None)
+        return dt
+
+
+class ReservationUpdate(BaseModel):
+    guest_name: Optional[str] = None
+    party_size: Optional[int] = None
+    phone: Optional[str] = None
+    email: Optional[str] = None
+    note: Optional[str] = None
+    reserved_for: Optional[datetime] = None
+    table_id: Optional[int] = None
+    status: Optional[str] = None
+
+    @field_validator("reserved_for", mode="before")
+    @classmethod
+    def strip_timezone(cls, v):
+        if v is None:
+            return v
+        if isinstance(v, str):
+            dt = datetime.fromisoformat(v.replace("Z", "+00:00"))
+        elif isinstance(v, datetime):
+            dt = v
+        else:
+            return v
+        if dt.tzinfo is not None:
+            dt = dt.astimezone().replace(tzinfo=None)
+        return dt
+
+
+class ReservationStatusUpdate(BaseModel):
+    status: str  # arrived | cancelled | no_show | pending
+
+
+class ReservationOut(BaseModel):
+    id: int
+    guest_name: str
+    party_size: int
+    phone: Optional[str] = None
+    email: Optional[str] = None
+    note: Optional[str] = None
+    reserved_for: datetime
+    table_id: Optional[int] = None
+    status: str
+    source: str
+    created_by_user_id: Optional[int] = None
+    online_customer_id: Optional[str] = None
+    created_at: datetime
+    updated_at: datetime
+
+    # Denormalized for convenience
+    table_label: Optional[str] = None
+    created_by_name: Optional[str] = None
+
+    model_config = {"from_attributes": True}
+
+
+# Compact summary embedded in TableOut for the RESERVED badge
+class ReservationSummary(BaseModel):
+    id: int
+    guest_name: str
+    party_size: int
+    reserved_for: datetime
+    status: str
+
+    model_config = {"from_attributes": True}