fix: ?dateien=1 filter time (single NER pass, 420 s timeout, clearer errors)

feat: /iserv/freigabe releases unchecked files (APPROVE_TOKEN, 10 min, once)

feat: /iserv/tasks?dateien=1 passes original files without names

fix(iserv): no repeated text from merged DOCX cells

feat(iserv): shorter output, finished tasks only with ?alle=1

feat(iserv): filtered IServ tasks for Muse