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

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

src/features/admin-users/mapper.ts

@@ -0,0 +1,27 @@
+import { visibleEmail } from "@/shared/account-email";
+import type { AdminUser } from "./types";
+
+type RawAdminUser = {
+  id: string;
+  name: string;
+  email: string;
+  username?: string | null;
+  role?: string | null;
+  banned?: boolean | null;
+  banReason?: string | null;
+  createdAt: Date | string;
+};
+
+/** Better Auth kullanıcı kaydını arayüz satırına çevirir (yer tutucu e-posta gizlenir). */
+export function toAdminUser(u: RawAdminUser): AdminUser {
+  return {
+    id: u.id,
+    name: u.name,
+    username: u.username ?? "",
+    email: visibleEmail(u.email),
+    role: u.role === "admin" ? "admin" : "user",
+    banned: Boolean(u.banned),
+    banReason: u.banReason ?? undefined,
+    createdAt: new Date(u.createdAt).toISOString(),
+  };
+}