Generalize email system with invoice workflow and Stiftungsgeschichte category

- Rename DestinataerEmailEingang → EmailEingang with category support
  (destinataer, rechnung, land_pacht, stiftungsgeschichte, allgemein)
- Add invoice capture workflow: create Verwaltungskosten from email,
  link DMS documents as invoice attachments, track payment status
- Add Stiftungsgeschichte email category with auto-detection patterns
  (Ahnenforschung, Genealogie, Chronik, etc.) and DMS integration
- Update poll_emails task with category detection and DMS context mapping
- Show available history documents in Geschichte editor sidebar
- Consolidate DMS views, remove legacy dokument templates
- Update all detail/form templates for DMS document linking
- Add deploy.sh script and streamline compose.yml

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

app/templates/stiftung/verpachtung_form.html

@@ -341,7 +341,7 @@
                     </div>
                     <div class="card-body">
                         <p class="text-muted small">Dokumente können nach dem Speichern der Verpachtung verknüpft werden.</p>
-                        <a href="{% url 'stiftung:dokument_create' %}?land_verpachtung_id={{ form.instance.pk }}" 
+                        <a href="{% url 'stiftung:dms_upload' %}?land_verpachtung_id={{ form.instance.pk }}"
                            class="btn btn-outline-primary btn-sm">
                             <i class="fas fa-plus me-1"></i>Neues Dokument
                         </a>