Refactor authentication system: replace NextAuth with custom login/logout/session handling, improve cookie management, and enhance error handling

app/mod/layout.tsx

@@ -1,6 +1,4 @@
-import { redirect } from "next/navigation"
-import { getServerSession } from "next-auth/next"
-import { authOptions } from "@/lib/auth"
+import { requireModSessionUser } from "@/lib/server-auth"
 import { CollapsibleSidebar } from "./collapsible-sidebar"
 
 export default async function ModLayout({
@@ -8,12 +6,7 @@ export default async function ModLayout({
 }: {
     children: React.ReactNode
 }) {
-    const session = await getServerSession(authOptions)
-
-    // Kiểm tra quyền
-    if (!session || (session.user.role !== "MOD" && session.user.role !== "ADMIN")) {
-        redirect("/") // Không đủ quyền, đưa về trang chủ
-    }
+    await requireModSessionUser()
 
     return (
         <div className="flex min-h-[calc(100vh-3.5rem)] bg-muted/20">