feat(admin): Server Action'larla kullanıcı yönetimi ve gerçek oturumlu sayfalar

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/components/layout/app-shell-fallback.tsx

@@ -0,0 +1,26 @@
+import { Skeleton } from "@/components/ui/skeleton";
+import { tr } from "@/i18n/tr";
+
+/** Oturum okunurken gösterilen kabuk iskeleti (yan menü + üst bar + içerik). */
+export function AppShellFallback() {
+  return (
+    <div role="status" aria-label={tr.common.loading} className="flex min-h-dvh w-full">
+      <div className="hidden w-64 shrink-0 flex-col gap-3 border-r bg-sidebar p-3 md:flex">
+        <Skeleton className="h-8 w-28" />
+        {Array.from({ length: 8 }, (_, i) => (
+          <Skeleton key={i} className="h-7 w-full" />
+        ))}
+      </div>
+      <div className="flex flex-1 flex-col">
+        <div className="flex h-14 items-center gap-2 border-b px-4">
+          <Skeleton className="h-8 w-48" />
+          <Skeleton className="ml-auto size-8 rounded-full" />
+        </div>
+        <div className="flex flex-col gap-4 p-4 md:p-6">
+          <Skeleton className="h-8 w-56" />
+          <Skeleton className="h-24 w-full" />
+        </div>
+      </div>
+    </div>
+  );
+}

src/components/layout/user-menu.tsx

@@ -15,6 +15,7 @@ import {
   DropdownMenuTrigger,
 } from "@/components/ui/dropdown-menu";
 import type { SessionUser } from "@/features/auth/types";
+import { authClient } from "@/lib/auth-client";
 import { tr } from "@/i18n/tr";
 
 export function initials(name: string) {
@@ -30,10 +31,15 @@ export function initials(name: string) {
 export function UserMenu({ user, version }: { user: SessionUser; version: string }) {
   const router = useRouter();
 
-  function logout() {
-    // FAZ 3: authClient.signOut() sonrası yönlendirme.
+  async function logout() {
+    const { error } = await authClient.signOut();
+    if (error) {
+      toast.error(tr.common.genericError);
+      return;
+    }
     toast.success(tr.userMenu.loggedOut);
     router.replace("/login");
+    router.refresh();
   }
 
   return (
@@ -61,7 +67,7 @@ export function UserMenu({ user, version }: { user: SessionUser; version: string
           </Badge>
         </DropdownMenuLabel>
         <DropdownMenuSeparator />
-        <DropdownMenuItem variant="destructive" onSelect={logout}>
+        <DropdownMenuItem variant="destructive" onSelect={() => void logout()}>
           <LogOut />
           {tr.userMenu.logout}
         </DropdownMenuItem>