fix: move Data Migration from separate 'customDev' section to 'customization'

Avoid creating separate admin panel sections for each extension.
All custom settings go under the existing "התאמה אישית" section.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

files/custom/Espo/Modules/DataMigration/Resources/metadata/app/adminPanel.json

@@ -1,6 +1,5 @@
 {
-    "customDev": {
+    "customization": {
-        "label": "Custom Development",
         "itemList": [
             "__APPEND__",
             {
@@ -11,7 +10,6 @@
                 "view": "modules/data-migration/views/admin/data-migration",
                 "order": 50
             }
-        ],
+        ]
-        "order": 30
     }
 }