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/schemas/orders.py

@@ -10,6 +10,7 @@ integer-kopecks из CLAUDE.md относится к будущим персис
 from __future__ import annotations
 
 from datetime import datetime
+from decimal import Decimal
 from typing import TYPE_CHECKING, Any
 
 from pydantic import BaseModel, ConfigDict, Field, field_validator
@@ -88,6 +89,7 @@ class OrderRowOut(BaseModel):
     receipt_status: str | None = None
     receipt_error: str | None = None
     receipt_prepayment: str | None = None
+    edited: bool = False
 
     @classmethod
     def from_order(cls, order: Order, receipt: Receipt | None = None) -> OrderRowOut:
@@ -116,4 +118,43 @@ class OrderRowOut(BaseModel):
             receipt_prepayment=(
                 f"{receipt.prepayment_kopecks / 100:.2f}" if receipt else None
             ),
+            edited=order.edited_at is not None,
         )
+
+
+class OrderGoodIn(BaseModel):
+    """Позиция заказа из формы редактирования. `amount` считает сервер."""
+
+    id: str | None = Field(default=None, max_length=64)
+    sku: str = Field(default="", max_length=128)
+    name: str = Field(min_length=1, max_length=512)
+    price: Decimal = Field(ge=0, max_digits=12, decimal_places=2)
+    quantity: Decimal = Field(gt=0, max_digits=12, decimal_places=3)
+    discount_amount: Decimal = Field(default=Decimal(0), ge=0, max_digits=12, decimal_places=2)
+
+    @field_validator("sku", "name", mode="after")
+    @classmethod
+    def _strip(cls, value: str) -> str:
+        return value.strip()
+
+
+class OrderUpdateIn(BaseModel):
+    """`PATCH /orders/{id}` — полная замена редактируемых полей заказа."""
+
+    recipient_name: str | None = Field(default=None, max_length=255)
+    recipient_phone: str | None = Field(default=None, max_length=32)
+    recipient_email: str | None = Field(default=None, max_length=320)
+    waybill_number: str | None = Field(default=None, max_length=64)
+    notes: str | None = None
+    total_amount: Decimal = Field(ge=0, max_digits=12, decimal_places=2)
+    goods: list[OrderGoodIn] = Field(min_length=1)
+
+    # Пустая строка из формы = «не указано».
+    @field_validator(
+        "recipient_name", "recipient_phone", "recipient_email", "waybill_number", "notes"
+    )
+    @classmethod
+    def _blank_to_none(cls, value: str | None) -> str | None:
+        if value is None:
+            return None
+        return value.strip() or None