chore: bulk commit of pre-existing changes

Includes:
- Admin dashboard layout and page updates
- API account auth module (routes, schemas, service)
- Dashboard sign-up form extraction, middleware refactor
- Marketplace proxy and middleware updates
- CORS origins expansion for dev environment
- Seed email domain correction (.com → .ma)
- Docs: create-account guide, fleet page, signup plan
- Various UI component and layout refinements

apps/admin/src/app/layout.tsx

@@ -3,8 +3,8 @@ import { AdminI18nProvider } from '@/components/I18nProvider'
 import './globals.css'
 
 export const metadata: Metadata = {
-  title: 'RentalDriveGo Admin',
-  description: 'Platform administration for RentalDriveGo.',
+  title: 'FleetOS Admin',
+  description: 'FleetOS platform administration.',
 }
 
 export default function RootLayout({ children }: { children: React.ReactNode }) {