feat: add admin links management and updaterup page

- Implemented AdminLinksPage for managing link entries with admin role check.
- Created API routes for fetching, updating, and deleting link entries.
- Added ProductTabs component for navigation between Backerup and Updaterup.
- Developed UpdaterupPage with detailed features, setup instructions, and statistics.
- Introduced links database functionality for runtime-editable link overrides.

frontend/app/components/ProductTabs.tsx

@@ -0,0 +1,34 @@
+"use client";
+
+import Link from "next/link";
+import { usePathname } from "next/navigation";
+
+export default function ProductTabs() {
+  const pathname = usePathname();
+  const isUpdaterup = pathname.startsWith("/updaterup");
+
+  return (
+    <div className="flex items-center gap-1 rounded-xl border border-white/8 bg-white/3 p-1">
+      <Link
+        href="/"
+        className={`px-4 py-1.5 rounded-lg text-sm font-semibold transition-all ${
+          !isUpdaterup
+            ? "bg-cyan-500/20 text-cyan-300 border border-cyan-500/30 shadow-sm"
+            : "text-slate-400 hover:text-slate-200 hover:bg-white/5"
+        }`}
+      >
+        Backerup
+      </Link>
+      <Link
+        href="/updaterup"
+        className={`px-4 py-1.5 rounded-lg text-sm font-semibold transition-all ${
+          isUpdaterup
+            ? "bg-violet-500/20 text-violet-300 border border-violet-500/30 shadow-sm"
+            : "text-slate-400 hover:text-slate-200 hover:bg-white/5"
+        }`}
+      >
+        Updaterup
+      </Link>
+    </div>
+  );
+}