Revert "Add missing admin action files and navigation links"

This reverts commit 41be6835bf.

src/app/admin/permissions/loading.tsx

@@ -1,28 +0,0 @@
-import { Skeleton } from '@/components/ui/skeleton'
-
-export default function PermissionsLoading() {
-  return (
-    <div className="space-y-6">
-      <div className="flex items-center justify-between">
-        <div>
-          <Skeleton className="h-9 w-40" />
-          <Skeleton className="h-5 w-64 mt-2" />
-        </div>
-      </div>
-      <div className="flex items-center gap-3">
-        <Skeleton className="h-10 w-64" />
-        <Skeleton className="h-10 w-24" />
-      </div>
-      <div className="rounded-md border">
-        {Array.from({ length: 8 }).map((_, i) => (
-          <div key={i} className="flex items-center gap-6 px-4 py-3 border-b last:border-0">
-            <Skeleton className="h-4 w-12" />
-            <Skeleton className="h-4 w-32" />
-            <Skeleton className="h-4 w-24" />
-            <Skeleton className="h-5 w-16 rounded-full" />
-          </div>
-        ))}
-      </div>
-    </div>
-  )
-}