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/land_abrechnung_detail.html

@@ -303,11 +303,8 @@
                     {% endif %}
                     
                     <div class="d-grid gap-2">
-                        <a href="{% url 'stiftung:dokument_management' %}" class="btn btn-outline-primary btn-sm">
-                            <i class="fas fa-link me-2"></i>Dokumente verknüpfen
-                        </a>
-                        <a href="mailto:paperless@vhtv-stiftung.de?subject=Dokumente für {{ land }}" class="btn btn-outline-info btn-sm">
-                            <i class="fas fa-envelope me-2"></i>E-Mail an Paperless
+                        <a href="{% url 'stiftung:dms_list' %}" class="btn btn-outline-primary btn-sm">
+                            <i class="fas fa-folder-open me-2"></i>Zum DMS
                         </a>
                     </div>
                 </div>