Ask for organization business field at signup, including jewelry.

Store Didar-style industry on the org so registration, settings, and Ask Mento share the same catalog.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/prisma/schema.prisma

@@ -134,6 +134,8 @@ model Organization {
   id                String                   @id @default(cuid())
   name              String
   slug              String                   @unique
+  /// زمینه فعالیت سازمان — فهرست هم‌تراز صنایع دیدار
+  businessField     String?
   baseCurrency      String                   @default("IRR")
   enabledCurrencies String[]                 @default(["IRR", "USD", "EUR"])
   createdAt         DateTime                 @default(now())