Cron: Frequenz-Check entfernt, IMAP nur bei Konfiguration

- shouldRunImport() Prüfung entfernt (Dolibarr-Cron steuert Frequenz)
- IMAP-Import nur wenn Host konfiguriert (verhindert Fehlermeldung)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

class/cron_importzugferd.class.php

@@ -131,12 +131,6 @@ class CronImportZugferd
 
         $langs->load('importzugferd@importzugferd');
 
-        // Check if we should run based on frequency
-        if (!$this->shouldRunImport()) {
-            $this->output = 'Skipped - not scheduled to run (frequency: '.getDolGlobalString('IMPORTZUGFERD_IMPORT_FREQUENCY', 'manual').')';
-            return 0;
-        }
-
         // Reset counters
         $this->imported_count = 0;
         $this->skipped_count = 0;
@@ -144,7 +138,12 @@ class CronImportZugferd
         $this->errors = array();
 
         $folderResult = $this->importFromFolder();
-        $mailboxResult = $this->fetchFromMailbox();
+
+        // IMAP nur wenn konfiguriert
+        $mailboxResult = 0;
+        if (!empty(getDolGlobalString('IMPORTZUGFERD_IMAP_HOST'))) {
+            $mailboxResult = $this->fetchFromMailbox();
+        }
 
         // Update last run time
         $this->updateLastRunTime();