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/administration.html

@@ -260,7 +260,7 @@
                             </a>
                         </div>
                         <div class="col-md-3 mb-3">
-                            <a href="{% url 'stiftung:dokument_management' %}" class="btn btn-outline-secondary w-100">
+                            <a href="{% url 'stiftung:dms_list' %}" class="btn btn-outline-secondary w-100">
                                 <i class="fas fa-folder-open d-block mb-2 fa-2x"></i>
                                 <span>Dokumentenverwaltung</span>
                             </a>