Allow editing orders in the order card

Cashiers can edit recipient, TTN, notes, goods and total in the order
modal and save via PATCH /orders/{id}. Edited orders get edited_at and
are no longer overwritten by CRM sync. Editing is blocked once a receipt
exists; changing the TTN resets Nova Poshta tracking fields.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

backend/app/api/v1/orders.py

@@ -1,4 +1,4 @@
-"""Локальная очередь заказов (синхронизируется из CRM) — список, вкладки, удаление."""
+"""Локальная очередь заказов (синхронизируется из CRM) — список, вкладки, правка, удаление."""
 
 from __future__ import annotations
 
@@ -6,7 +6,7 @@ from fastapi import APIRouter, Depends, HTTPException, Request, status
 
 from app.api.deps import CashierUser, CrmClientDep, SessionDep, require_any
 from app.db.models.audit import AuditAction
-from app.schemas.orders import OrderRowOut
+from app.schemas.orders import OrderRowOut, OrderUpdateIn
 from app.services import audit
 from app.services import orders as orders_service
 from app.services import receipts as receipts_service
@@ -28,6 +28,38 @@ async def list_orders(
     return [OrderRowOut.from_order(order, receipts.get(order.id)) for order in orders]
 
 
+@router.patch("/{order_id}", response_model=OrderRowOut, response_model_by_alias=False)
+async def update_order(
+    order_id: str,
+    payload: OrderUpdateIn,
+    request: Request,
+    session: SessionDep,
+    actor: CashierUser,
+) -> OrderRowOut:
+    try:
+        result = await orders_service.update_order(session, order_id, payload)
+    except orders_service.OrderEditError as exc:
+        raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail=str(exc)) from exc
+    if result is None:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Заказ не найден")
+
+    order, changed = result
+    if changed:
+        await audit.record(
+            session,
+            action=AuditAction.ORDER_UPDATED,
+            user=actor,
+            entity_type="order",
+            entity_id=order.id,
+            payload={"fields": changed},
+            request=request,
+        )
+        await session.commit()
+
+    receipts = await receipts_service.latest_receipts_by_order(session, [order.id])
+    return OrderRowOut.from_order(order, receipts.get(order.id))
+
+
 @router.delete("/{order_id}", status_code=status.HTTP_204_NO_CONTENT)
 async def delete_order(
     order_id: str, request: Request, session: SessionDep, actor: CashierUser