feat(get-user): emit brand_chrome for Hamkar brandManaged opt-in

Expose brand_chrome so apps apply header/menu/body colors only after SuperAdmin color save.

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

prisma/lib/appearance-builders.ts

@@ -34,6 +34,7 @@ export function buildHamkarUiFromBrand(input: {
   secondaryColor?: string | null
   backgroundColor?: string | null
   settingsManaged?: boolean
+  brandManaged?: boolean
   registryMode?: string | null
   settings?: {
     pricing_box_theme?: string
@@ -57,6 +58,7 @@ export function buildHamkarUiFromBrand(input: {
   const base = {
     kind: 'hamkar' as const,
     settingsManaged: Boolean(input.settingsManaged),
+    brandManaged: Boolean(input.brandManaged),
     registryMode: input.registryMode || 'dynamicMode',
     brand: {
       // Keep nulls — do NOT invent #1d4ed8 (causes wrong accent vs live registry)