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/tests/test_orders_service.py

@@ -1,10 +1,16 @@
-"""Юнит-тесты чистых хелперов сервиса заказов. Без БД и без сети."""
+"""Юнит-тесты сервиса заказов. Без БД и без сети — сессия подменяется заглушкой."""
 
 from __future__ import annotations
 
-from datetime import datetime
+import asyncio
+from datetime import UTC, datetime
+from typing import Any
 
-from app.services.orders import _parse_crm_datetime, _to_kopecks
+import pytest
+
+from app.db.models.order import Order
+from app.schemas.orders import OrderUpdateIn
+from app.services.orders import OrderEditError, _parse_crm_datetime, _to_kopecks, update_order
 
 
 class TestToKopecks:
@@ -24,3 +30,121 @@ class TestToKopecks:
 class TestParseCrmDatetime:
     def test_parses_crm_format(self) -> None:
         assert _parse_crm_datetime("2026-09-20 10:00:00") == datetime(2026, 9, 20, 10, 0, 0)
+
+
+class _FakeSession:
+    def __init__(self, order: Order | None) -> None:
+        self.order = order
+
+    async def scalar(self, query: Any) -> Order | None:
+        return self.order
+
+
+def _order(**overrides: Any) -> Order:
+    fields: dict[str, Any] = {
+        "id": "1",
+        "recipient_name": "Тест",
+        "recipient_phone": "0501112233",
+        "recipient_email": None,
+        "waybill_number": "20450000000001",
+        "notes": None,
+        "total_amount_kopecks": 120000,
+        "goods": [],
+        "is_deleted": False,
+        "receipt_created_at": None,
+        "edited_at": None,
+        "np_status": "Прибув",
+        "np_status_code": "7",
+        "np_cod_amount_kopecks": 120000,
+        "np_payment_status": "NeedPayment",
+    }
+    fields.update(overrides)
+    return Order(**fields)
+
+
+_GOOD = {
+    "id": "1",
+    "sku": "A",
+    "name": "Товар",
+    "price": "600.00",
+    "quantity": "2",
+    "discount_amount": "50.00",
+}
+
+
+def _payload(**overrides: Any) -> OrderUpdateIn:
+    data: dict[str, Any] = {
+        "recipient_name": "Тест",
+        "recipient_phone": "0501112233",
+        "recipient_email": "",
+        "waybill_number": "20450000000001",
+        "notes": "",
+        "total_amount": "1100.00",
+        "goods": [_GOOD],
+    }
+    data.update(overrides)
+    return OrderUpdateIn.model_validate(data)
+
+
+def _update(order: Order | None, payload: OrderUpdateIn) -> tuple[Order, list[str]]:
+    result = asyncio.run(update_order(_FakeSession(order), "1", payload))  # type: ignore[arg-type]
+    assert result is not None
+    return result
+
+
+class TestUpdateOrder:
+    def test_recomputes_line_amount_and_marks_edited(self) -> None:
+        order, changed = _update(_order(), _payload())
+
+        assert order.goods[0]["amount"] == "1150.00"
+        assert order.goods[0]["quantity"] == "2.000"
+        assert order.total_amount_kopecks == 110000
+        assert order.edited_at is not None
+        assert set(changed) == {"goods", "total_amount"}
+
+    def test_blank_strings_become_null(self) -> None:
+        order, _ = _update(_order(), _payload(notes="  "))
+
+        assert order.notes is None
+        assert order.recipient_email is None
+
+    def test_new_line_gets_generated_id(self) -> None:
+        good = {"sku": "", "name": "Новый", "price": "10.00", "quantity": "1"}
+        order, _ = _update(_order(), _payload(goods=[good], total_amount="10.00"))
+
+        assert order.goods[0]["id"].startswith("new-")
+
+    def test_waybill_change_resets_np_tracking(self) -> None:
+        order, changed = _update(_order(), _payload(waybill_number="20450000000002"))
+
+        assert "waybill_number" in changed
+        assert order.np_status is None
+        assert order.np_cod_amount_kopecks is None
+
+    def test_no_changes_does_not_mark_edited(self) -> None:
+        # Снимок в формате CRM ("2", а не "2.000") — формат строк не считается правкой.
+        stored = {**_GOOD, "discount_percent": "4.17", "amount": "1150.00"}
+        order, changed = _update(_order(goods=[stored], total_amount_kopecks=110000), _payload())
+
+        assert changed == []
+        assert order.edited_at is None
+        assert order.goods == [stored]
+
+    def test_total_above_goods_sum_is_rejected(self) -> None:
+        with pytest.raises(OrderEditError, match="больше суммы товаров"):
+            _update(_order(), _payload(total_amount="1200.00"))
+
+    def test_discount_above_line_sum_is_rejected(self) -> None:
+        good = {"name": "Товар", "price": "10.00", "quantity": "1", "discount_amount": "11"}
+        with pytest.raises(OrderEditError, match="скидка больше"):
+            _update(_order(), _payload(goods=[good], total_amount="0"))
+
+    def test_order_with_receipt_is_locked(self) -> None:
+        with pytest.raises(OrderEditError, match="уже создан чек"):
+            _update(_order(receipt_created_at=datetime.now(UTC)), _payload())
+
+    def test_missing_or_deleted_order_returns_none(self) -> None:
+        payload = _payload()
+        assert asyncio.run(update_order(_FakeSession(None), "1", payload)) is None  # type: ignore[arg-type]
+        deleted = _FakeSession(_order(is_deleted=True))
+        assert asyncio.run(update_order(deleted, "1", payload)) is None  # type: ignore[arg-type]