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/db/models/audit.py

@@ -32,6 +32,7 @@ class AuditAction(str):
     USER_UPDATED = "user.updated"
     USER_DEACTIVATED = "user.deactivated"
     ORDER_DELETED = "order.deleted"
+    ORDER_UPDATED = "order.updated"
     CASH_REGISTER_CREATED = "cash_register.created"
     CASH_REGISTER_UPDATED = "cash_register.updated"
     RECEIPT_CREATE_REQUESTED = "receipt.create_requested"

backend/app/db/models/order.py

@@ -41,6 +41,10 @@ class Order(TimestampMixin, Base):
     is_deleted: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, index=True)
     deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
 
+    # Заказ правили вручную в карточке — синхронизация из CRM его больше не
+    # перезаписывает, иначе правки кассира затирались бы при следующем открытии.
+    edited_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+
     # Заполняется будущей интеграцией с Checkbox — сейчас всегда NULL.
     receipt_created_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), index=True)