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_form.html

@@ -234,14 +234,11 @@
                     </div>
                     <div class="card-body">
                         <p class="text-muted mb-3">
-                            Dokumente werden über Paperless verwaltet und verknüpft.
+                            Dokumente werden im DMS verwaltet.
                         </p>
                         <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" 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>