refactor: migrate authentication from Supabase to Better Auth and update Prisma schema models

apps/backend/src/app.ts

@@ -21,6 +21,9 @@ export function createApp() {
       },
       allowHeaders: ['Authorization', 'Content-Type'],
       allowMethods: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'],
+      exposeHeaders: ["Content-Length"],
+      maxAge: 600,
+      credentials: true,
     })
   );