WIP: Sicherheitsnetz vor Phase-1-R\u00fcckbau

Enth\u00e4lt gemischt: Laravel-10-Upgrade + Phase 1 (Contacts-Modul, Duplicats-Commands,
Soft-Delete+Merge-Fields) + Phase 2 Code-Umstellungen (inquiry_id, $table='contacts'/'inquiries')
+ Offers-Modul (Migrationen, Models, offer_id in Booking, offer-Disk in filesystems.php).

Phase 2 + Offers werden im folgenden Commit nach dev/backups/phase2-offers-2026-04-17/
verschoben, damit der Workspace auf Phase-1-only (= Test-System-Stand) reduziert ist
und direkt auf Live deploybar wird.

Tarball-Backup zus\u00e4tzlich unter: ../backups-safety/workspace-pre-phase1-rollback-2026-04-17.tar.gz

Made-with: Cursor

app/Models/IQContentTreeNode.php

@@ -72,7 +72,7 @@ class IQContentTreeNode extends Model
 
     protected $connection = 'mysql_stern';
 
-    protected $dates = ['deleted_at'];
+    
 
     protected $table = 'i_q_content_tree_nodes';
 
@@ -80,7 +80,9 @@ class IQContentTreeNode extends Model
         'tree_id', 'parent_id', 'lvl', 'name', 'identifier', 'title', 'description', 'settings', 'image', 'pos', 'active',
     ];
 
-    protected $casts = ['settings' => 'array', 'image' => 'array'];
+    protected $casts = ['settings' => 'array', 'image' => 'array',
+		'deleted_at' => 'datetime',
+	];
 
     public function sluggable(): array
     {