Add Khanegi uiVariant modular/newTheme with get_user payload split.

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

prisma/migrations/20260809120000_khanegi_ui_variant/migration.sql

@@ -0,0 +1,14 @@
+-- Khanegi appearance family: modular (default) vs newTheme.
+CREATE TYPE "KhanegiUiVariant" AS ENUM ('modular', 'newTheme');
+
+ALTER TABLE "tenants"
+ADD COLUMN "ui_variant" "KhanegiUiVariant" NOT NULL DEFAULT 'modular';
+
+-- Pilot already on new theme
+UPDATE "tenants"
+SET "ui_variant" = 'newTheme'
+WHERE "product" = 'khanegi'
+  AND (
+    "domain" = 'app.aygingold.ir'
+    OR ("domains"::text ILIKE '%app.aygingold.ir%')
+  );