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/stiftung/views/dms.py

@@ -115,6 +115,7 @@ def dms_upload(request):
         "land_id": request.GET.get("land", ""),
         "paechter_id": request.GET.get("paechter", ""),
         "verpachtung_id": request.GET.get("verpachtung", ""),
+        "foerderung_id": request.GET.get("foerderung", ""),
         "kontext": request.GET.get("kontext", "anderes"),
     }
 
@@ -144,6 +145,7 @@ def dms_upload(request):
             land_id = request.POST.get("land_id", "").strip()
             paechter_id = request.POST.get("paechter_id", "").strip()
             verp_id = request.POST.get("verpachtung_id", "").strip()
+            foerd_id = request.POST.get("foerderung_id", "").strip()
 
             if dest_id:
                 try:
@@ -165,6 +167,11 @@ def dms_upload(request):
                     dok.verpachtung_id = verp_id
                 except Exception:
                     pass
+            if foerd_id:
+                try:
+                    dok.foerderung_id = foerd_id
+                except Exception:
+                    pass
 
             _save_upload(request, dok)