feat: migrate from node to vercel adapter and add vercel config

chore: update package.json dependencies for vercel deployment
fix: add www subdomain to allowed origins in like/dislike API endpoints
chore: add vercel to gitignore

src/pages/api/dislike/[postId].ts

@@ -37,6 +37,7 @@ export const POST: APIRoute = async ({ params, request }) => {
   const allowedOrigins = [
     'https://cojocarudavid.me',  // Replace with your actual domain
     'http://localhost:3000',   // For local development
+    'https://www.cojocarudavid.me', // Replace with your actual domain
   ];
 
   if (!origin || !allowedOrigins.includes(origin)) {

src/pages/api/like/[postId].ts

@@ -38,6 +38,7 @@ export const POST: APIRoute = async ({ params, request }) => {
   const allowedOrigins = [
     'https://cojocarudavid.me',  // Replace with your actual domain
     'http://localhost:3000',   // For local development
+    'https://www.cojocarudavid.me', // Replace with your actual domain
   ];
 
   if (!origin || !allowedOrigins.includes(origin)) {