fix: update database queries to use 'active' instead of 'is_active' for consistency

auth/src/core/auth.core.js

@@ -33,7 +33,7 @@ async function register(username, password) {
  * Esegue il login di un utente
  */
 async function login(username, password) {
-    const result = await query('SELECT id, username, password_hash, is_active, created_at FROM users WHERE username = $1', [username]);
+    const result = await query('SELECT id, username, password_hash, active, created_at FROM users WHERE username = $1', [username]);
     if (result.rows.length === 0) {
         throw new Error('No user matched')
     }
@@ -105,7 +105,7 @@ async function validateSession(token) {
         throw new Error('Session user mismatch');
     }
 
-    if (!session.is_active) {
+    if (!session.active) {
         throw new Error('Session is not active');
     }
 }