feat: upgrade next-auth to v5.0.0-beta.29 and refactor authentication middleware

- Updated next-auth dependency in package.json to version 5.0.0-beta.29.
- Refactored create-admin script to use a valid email format.
- Implemented authentication middleware for various API routes to enforce access control.
- Refactored API route handlers to improve readability and maintainability.
- Enhanced error handling in authentication error page.
- Added detailed tests for authentication flow, including protected routes and NextAuth endpoints.

src/app/api/contracts/[id]/route.js

@@ -1,7 +1,8 @@
 import db from "@/lib/db";
 import { NextResponse } from "next/server";
+import { withReadAuth, withUserAuth } from "@/lib/middleware/auth";
 
-export async function GET(req, { params }) {
+async function getContractHandler(req, { params }) {
 	const { id } = await params;
 
 	const contract = db
@@ -20,7 +21,7 @@ export async function GET(req, { params }) {
 	return NextResponse.json(contract);
 }
 
-export async function DELETE(req, { params }) {
+async function deleteContractHandler(req, { params }) {
 	const { id } = params;
 
 	try {
@@ -57,3 +58,7 @@ export async function DELETE(req, { params }) {
 		);
 	}
 }
+
+// Protected routes - require authentication  
+export const GET = withReadAuth(getContractHandler);
+export const DELETE = withUserAuth(deleteContractHandler);