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/main.py

@@ -19,6 +19,7 @@ import models.shift         # noqa: F401 — registers WaiterShift, ShiftBreak
 import models.settings      # noqa: F401
 import models.flag          # noqa: F401 — registers TableFlagDef, TableFlagAssignment
 import models.message       # noqa: F401 — registers StaffMessage, StaffMessageAck, QuickMessageTemplate
+import models.reservation   # noqa: F401
 
 from routers import auth, tables, products, orders, waiters, reports, system, setup as setup_router
 from routers import business_day as business_day_router
@@ -29,6 +30,7 @@ from routers import messages as messages_router
 from routers import sse as sse_router
 from routers import data_transfer as data_transfer_router
 from routers import connect_orders as connect_orders_router
+from routers import reservations as reservations_router
 
 
 def _run_migrations():
@@ -237,6 +239,29 @@ def _run_migrations():
         "ALTER TABLE products ADD COLUMN digital_price REAL",
         "ALTER TABLE products ADD COLUMN digital_discount REAL NOT NULL DEFAULT 0.0",
         "ALTER TABLE products ADD COLUMN digital_image_url VARCHAR",
+        # Per-printer line width (chars per line) — default 48 for 80mm Jolimark
+        "ALTER TABLE printers ADD COLUMN line_width INTEGER NOT NULL DEFAULT 48",
+        # Product description (plain-text, for menu display)
+        "ALTER TABLE products ADD COLUMN description TEXT",
+        # Staff note (internal memo on a waiter's profile)
+        "ALTER TABLE users ADD COLUMN note VARCHAR",
+        # Reservations table
+        """CREATE TABLE IF NOT EXISTS reservations (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            guest_name VARCHAR NOT NULL,
+            party_size INTEGER NOT NULL,
+            phone VARCHAR,
+            email VARCHAR,
+            note TEXT,
+            reserved_for DATETIME NOT NULL,
+            table_id INTEGER REFERENCES tables(id),
+            status VARCHAR NOT NULL DEFAULT 'pending',
+            source VARCHAR NOT NULL DEFAULT 'manager_app',
+            created_by_user_id INTEGER REFERENCES users(id),
+            online_customer_id VARCHAR,
+            created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+            updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
+        )""",
     ]
     for sql in migrations:
         try:
@@ -251,12 +276,15 @@ def _run_migrations():
 async def lifespan(app: FastAPI):
     import asyncio
     from services.sse_bus import init_loop
+    from services.reservation_tasks import start_reservation_tasks
     init_loop(asyncio.get_running_loop())
     Base.metadata.create_all(bind=engine)
     _run_migrations()
     sync_task = await start_cloud_sync()
+    reservation_task = await start_reservation_tasks()
     yield
     sync_task.cancel()
+    reservation_task.cancel()
 
 
 app = FastAPI(title="POS Local Backend", lifespan=lifespan)
@@ -295,3 +323,4 @@ app.include_router(messages_router.router,       prefix="/api/messages",     tag
 app.include_router(sse_router.router,            prefix="/api/sse",          tags=["sse"])
 app.include_router(data_transfer_router.router,  prefix="/api/data-transfer", tags=["data-transfer"])
 app.include_router(connect_orders_router.router, prefix="/api/connect",      tags=["connect"])
+app.include_router(reservations_router.router,   prefix="/api/reservations", tags=["reservations"])