refactor: renommage PachaFamily → HouseHub

- Remplacement de toutes les occurrences PachaFamily/pachafamily/PACHAFAMILY
- Renommage pachafamily_source.md → househub_source.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

includes/config.php

@@ -1,5 +1,5 @@
 <?php
-// PachaFamily Config - Version sans erreur
+// HouseHub Config - Version sans erreur
 if (!defined('ID_ALEX')) {
     define('ID_ALEX', 2);
     define('ID_LAIA', 3);