Add user rejection and device addition functionalities

- Implemented Rejectuser function to delete a user and send rejection details via SMS.
- Added SendUserRejectionDetailSMS function for SMS notifications.
- Introduced AddDevice function to create new devices associated with users.
- Updated user-actions.ts to include new functionalities and improve user management.
- Refactored auth-guard.ts to ensure proper session handling for admin access.

lib/auth-guard.ts

@@ -1,11 +1,12 @@
+"use server";
 import { auth } from "@/lib/auth";
-import { redirect } from "next/navigation";
 import { headers } from "next/headers";
+import { redirect } from "next/navigation";
 
-const session = await auth.api.getSession({
-	headers: await headers(),
-});
 export async function AdminAuthGuard() {
+	const session = await auth.api.getSession({
+		headers: await headers(),
+	});
 	if (session?.user.role !== "ADMIN") {
 		return redirect("/login");
 	}