feat: add 2FA and change title

backend/gestion/handlers/telegram.go

@@ -242,13 +242,20 @@ func UnlinkClientTelegram(c *gin.Context) {
 		return
 	}
 
+	clientID := c.GetInt("client_id")
 	database := c.MustGet("database").(*db.Database)
+
 	if err := database.DeleteClientTelegramChatID(username); err != nil {
 		log.Printf("❌ [TELEGRAM_UNLINK] Erreur pour %s: %v", username, err)
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "Erreur déliaison"})
 		return
 	}
 
+	// Désactiver la 2FA si Telegram est délié
+	if clientID > 0 {
+		_ = database.SetClientTwoFAEnabled(clientID, false)
+	}
+
 	log.Printf("✅ [TELEGRAM_UNLINK] Compte client %s délié", username)
 	c.JSON(http.StatusOK, gin.H{"success": true})
 }