- DMS edit view: add Destinatär, Land, Pächter, Verpachtung dropdowns so documents can be assigned to entities after upload - Geschichte: add M2M dokumente field on GeschichteSeite model - Geschichte form: checkboxes to select/link Stiftungsgeschichte docs - Geschichte detail: show linked documents in sidebar with download Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>