fix: skip entity types whose module is not installed during import

Prevents 500 error when importing a backup that contains entities
(e.g. SignatureRequest) from modules not installed on the target instance.

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

files/custom/Espo/Modules/DataMigration/Services/ImportService.php

@@ -100,6 +100,11 @@ class ImportService
                 continue;
             }
 
+            if (!$this->entityTypeExists($entityType)) {
+                $io->writeLine("Skipping {$entityType} (module not installed)");
+                continue;
+            }
+
             $io->writeLine("Importing {$entityType}...");
 
             $result = $this->entityImporter->import(
@@ -171,4 +176,14 @@ class ImportService
             }
         }
     }
+
+    private function entityTypeExists(string $entityType): bool
+    {
+        try {
+            $this->entityManager->getRDBRepository($entityType);
+            return true;
+        } catch (\Exception $e) {
+            return false;
+        }
+    }
 }