Fix database export and admin page structure

.env

@@ -0,0 +1,3 @@
+DATABASE_URL=postgresql://postgres:postgres@localhost:5432/la_huasca
+JWT_SECRET=your-jwt-secret-here
+NEXT_PUBLIC_SITE_NAME=Hotel La Huasca

src/lib/db.ts

@@ -34,3 +34,5 @@ export async function query(text: string, params?: unknown[]) {
   const result = await db.query(text, params);
   return result;
 }
+
+export { db };