chore: Update copyright year from 2025 to 2026 across core files

- Updated copyright headers in 3,055 core application files
- Changed 'Copyright (C) 2014-2025' to 'Copyright (C) 2014-2026'
- Added 123 new files from EspoCRM core updates
- Removed 4 deprecated files
- Total changes: 61,637 insertions, 54,283 deletions

This is a routine maintenance update for the new year 2026.

application/Espo/Core/Action/Actions/ConvertCurrency.php

@@ -3,7 +3,7 @@
  * This file is part of EspoCRM.
  *
  * EspoCRM – Open Source CRM application.
- * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Copyright (C) 2014-2026 EspoCRM, Inc.
  * Website: https://www.espocrm.com
  *
  * This program is free software: you can redistribute it and/or modify

application/Espo/Core/Action/Actions/Merge.php

@@ -3,7 +3,7 @@
  * This file is part of EspoCRM.
  *
  * EspoCRM – Open Source CRM application.
- * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Copyright (C) 2014-2026 EspoCRM, Inc.
  * Website: https://www.espocrm.com
  *
  * This program is free software: you can redistribute it and/or modify

application/Espo/Core/Action/Actions/Merge/Merger.php

@@ -3,7 +3,7 @@
  * This file is part of EspoCRM.
  *
  * EspoCRM – Open Source CRM application.
- * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Copyright (C) 2014-2026 EspoCRM, Inc.
  * Website: https://www.espocrm.com
  *
  * This program is free software: you can redistribute it and/or modify
@@ -42,6 +42,7 @@ use Espo\Core\Record\ActionHistory\Action;
 use Espo\Core\Record\ServiceContainer;
 use Espo\Core\Utils\Metadata;
 use Espo\Core\Utils\ObjectUtil;
+use Espo\Entities\Attachment;
 use Espo\Entities\Note;
 use Espo\ORM\Entity;
 use Espo\Entities\EmailAddress;
@@ -307,6 +308,13 @@ class Merger
                 continue;
             }
 
+            if (
+                $relationDefs->tryGetForeignEntityType() === Attachment::ENTITY_TYPE &&
+                $type === RelationType::HAS_CHILDREN
+            ) {
+                continue;
+            }
+
             if (
                 $type !== Entity::HAS_MANY &&
                 $type !== Entity::HAS_CHILDREN &&