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/dashboard/layout.tsx

@@ -89,7 +89,7 @@ export default function AdminDashboardLayout({ children }: { children: React.Rea
         <aside className="flex w-60 flex-shrink-0 flex-col border-r border-stone-200/80 bg-white/78 backdrop-blur-xl transition-colors dark:border-blue-900 dark:bg-[#07101e]/78">
           <Link href="/" className="block px-5 py-6">
             <p className="text-xs font-semibold uppercase tracking-[0.2em] text-orange-700 dark:text-orange-300">{dict.admin}</p>
-            <p className="mt-0.5 text-sm font-semibold text-blue-950 dark:text-stone-100">RentalDriveGo</p>
+            <p className="mt-0.5 text-sm font-semibold text-blue-950 dark:text-stone-100">FleetOS</p>
           </Link>
           <nav className="flex-1 px-3 space-y-0.5">
             {navLinks.map((link) => {