feat: port QA/money fixes from tehran_taj (atomic document confirm, validated inputs, expert customer edit/toggle/weights, made-to-order, grid sort/customer column)

Order-revision workflow kept as is: the direct admin line-edit routes were not ported.

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

apps/api/prisma/migrations/20261029120000_preorder_quantity/migration.sql

@@ -0,0 +1,3 @@
+-- Pieces asked for on a made-to-order request (legacy custom_orders.sum). Existing
+-- rows were all treated as one piece by the admin grid, so they keep 1.
+ALTER TABLE "PreOrder" ADD COLUMN "quantity" INTEGER NOT NULL DEFAULT 1;

apps/api/prisma/schema.prisma

@@ -947,6 +947,9 @@ model PreOrder {
   sizeSpec             String?
   stoneColor           String?
   minaColor            String?
+  /// Legacy custom_orders.sum — how many pieces the customer asked for. The first
+  /// schema had no field for it and the admin grid showed a hard-coded 1.
+  quantity             Int      @default(1)
   estimatedWeightGrams Decimal? @db.Decimal(14, 4)
   estimatedPriceRial   Decimal? @db.Decimal(20, 2)
   description          String?