feat(media): support local and s3 upload providers

apps/admin/src/app/media/page.tsx

@@ -2,6 +2,7 @@ import { getMediaFoundationSummary, listMediaAssets } from "@cms/db"
 
 import { AdminShell } from "@/components/admin-shell"
 import { MediaUploadForm } from "@/components/media/media-upload-form"
+import { resolveMediaStorageProvider } from "@/lib/media/storage"
 import { requirePermissionForRoute } from "@/lib/route-guards"
 
 export const dynamic = "force-dynamic"
@@ -33,6 +34,7 @@ export default async function MediaManagementPage({
   ])
   const notice = readFirstValue(resolvedSearchParams.notice)
   const error = readFirstValue(resolvedSearchParams.error)
+  const activeStorageProvider = resolveMediaStorageProvider(process.env.CMS_MEDIA_STORAGE_PROVIDER)
 
   return (
     <AdminShell
@@ -78,8 +80,8 @@ export default async function MediaManagementPage({
       <section className="rounded-xl border border-neutral-200 p-6">
         <h2 className="text-xl font-medium">Upload Media Asset</h2>
         <p className="mt-1 text-sm text-neutral-600">
-          Files are currently stored via local adapter. S3/object storage is the next incremental
-          step.
+          Upload storage provider: <strong>{activeStorageProvider}</strong>. You can switch via
+          `CMS_MEDIA_STORAGE_PROVIDER` (`local` or `s3`) until the admin settings toggle lands.
         </p>
         <MediaUploadForm />
       </section>