feat: add skip attachment files option for import

Allows importing only database records without restoring attachment
files. Useful when migrating data between instances.

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

files/client/custom/modules/data-migration/res/templates/admin/data-migration.tpl

@@ -150,6 +150,14 @@
                                 <span class="text-muted"> — {{translate 'skipDuplicatesHint' category='messages' scope='DataMigration'}}</span>
                             </label>
                         </div>
+
+                        <div class="checkbox">
+                            <label>
+                                <input type="checkbox" name="importNoFiles">
+                                {{translate 'Skip attachment files' scope='DataMigration'}}
+                                <span class="text-muted"> — {{translate 'importNoFilesHint' category='messages' scope='DataMigration'}}</span>
+                            </label>
+                        </div>
                     </div>
 
                     <div class="btn-group">

files/client/custom/modules/data-migration/src/views/admin/data-migration.js

@@ -301,6 +301,7 @@ define('modules/data-migration/views/admin/data-migration', ['view'], function (
 
             const preserveIds = this.$el.find('input[name="preserveIds"]').is(':checked');
             const skipDuplicates = this.$el.find('input[name="skipDuplicates"]').is(':checked');
+            const noFiles = this.$el.find('input[name="importNoFiles"]').is(':checked');
 
             const confirmMsg = dryRun
                 ? this.translate('dryRunConfirmation', 'messages', 'DataMigration')
@@ -315,6 +316,7 @@ define('modules/data-migration/views/admin/data-migration', ['view'], function (
                 Espo.Ajax.postRequest('DataMigration/action/import', {
                     backupName: this.selectedBackup,
                     preserveIds: preserveIds,
+                    noFiles: noFiles,
                     skipDuplicates: skipDuplicates,
                     dryRun: dryRun,
                 }, {timeout: 600000})