feat: ep:import-dates command on TYPO3 13

- Registered with #[AsCommand]; Configuration/Commands.php is no
  longer read
- Storage page of the imported records from the extension
  configuration (importStoragePid, 11 as in all site templates):
  frontend TypoScript is not available on the CLI in TYPO3 13
- The reseller and travel info page cache flush is gone with those
  plugins; the import still clears the page cache

Co-Authored-By: Claude Opus 5.5 <[email protected]>

config/system/settings.php

@@ -46,6 +46,7 @@ return [
             'contentFeedLanguages' => '0',
             'contentFeedNewsDetailPages' => 'ep-reisen:1392',
             'contentFeedSites' => 'ep-reisen,ser,ski-boarderweek,ski-wochenenden,snowzone',
+            'importStoragePid' => '11',
             'myEpApiBaseUrl' => '',
             'myEpApiClientId' => '',
             'myEpApiClientSecret' => '',