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/migrations/0050_generalize_email_rechnungsworkflow.py

@@ -0,0 +1,132 @@
+# Phase 4: Generalize EmailEingang + Rechnungsworkflow
+# - Rename DestinataerEmailEingang → EmailEingang
+# - Add kategorie, verwaltungskosten FK, land FK, verpachtung FK
+# - Expand status choices (rechnung_erfasst, zahlung_gebucht)
+# - Add verwaltungskosten FK to DokumentDatei
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stiftung', '0049_phase3_email_dms_m2m'),
+    ]
+
+    operations = [
+        # 1. Rename model (preserves DB table, updates Django state)
+        migrations.RenameModel(
+            old_name='DestinataerEmailEingang',
+            new_name='EmailEingang',
+        ),
+
+        # 2. Add kategorie field to EmailEingang
+        migrations.AddField(
+            model_name='emaileingang',
+            name='kategorie',
+            field=models.CharField(
+                choices=[
+                    ('destinataer', 'Destinataer'),
+                    ('rechnung', 'Rechnung'),
+                    ('land_pacht', 'Grundstueck / Pacht'),
+                    ('allgemein', 'Allgemein'),
+                ],
+                default='allgemein',
+                max_length=20,
+                verbose_name='Kategorie',
+            ),
+        ),
+
+        # 3. Add verwaltungskosten FK to EmailEingang
+        migrations.AddField(
+            model_name='emaileingang',
+            name='verwaltungskosten',
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name='email_eingaenge',
+                to='stiftung.verwaltungskosten',
+                verbose_name='Verwaltungskosten / Rechnung',
+            ),
+        ),
+
+        # 4. Add land FK to EmailEingang
+        migrations.AddField(
+            model_name='emaileingang',
+            name='land',
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name='email_eingaenge',
+                to='stiftung.land',
+                verbose_name='Laenderei',
+            ),
+        ),
+
+        # 5. Add verpachtung FK to EmailEingang
+        migrations.AddField(
+            model_name='emaileingang',
+            name='verpachtung',
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name='email_eingaenge',
+                to='stiftung.landverpachtung',
+                verbose_name='Verpachtung',
+            ),
+        ),
+
+        # 6. Update status choices on EmailEingang
+        migrations.AlterField(
+            model_name='emaileingang',
+            name='status',
+            field=models.CharField(
+                choices=[
+                    ('neu', 'Neu / Unbearbeitet'),
+                    ('zugewiesen', 'Destinataer zugewiesen'),
+                    ('verarbeitet', 'Verarbeitet'),
+                    ('rechnung_erfasst', 'Rechnung erfasst'),
+                    ('zahlung_gebucht', 'Zahlung gebucht'),
+                    ('unbekannt', 'Unbekannter Absender'),
+                    ('fehler', 'Fehler bei Verarbeitung'),
+                ],
+                default='neu',
+                max_length=20,
+                verbose_name='Status',
+            ),
+        ),
+
+        # 7. Update Meta on EmailEingang
+        migrations.AlterModelOptions(
+            name='emaileingang',
+            options={
+                'ordering': ['-eingangsdatum'],
+                'verbose_name': 'E-Mail-Eingang',
+                'verbose_name_plural': 'E-Mail-Eingaenge',
+            },
+        ),
+
+        # 8. Set kategorie='destinataer' for existing emails that have a destinataer FK
+        migrations.RunSQL(
+            sql="UPDATE stiftung_emaileingang SET kategorie = 'destinataer' WHERE destinataer_id IS NOT NULL;",
+            reverse_sql=migrations.RunSQL.noop,
+        ),
+
+        # 9. Add verwaltungskosten FK to DokumentDatei
+        migrations.AddField(
+            model_name='dokumentdatei',
+            name='verwaltungskosten',
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name='dms_dokumente',
+                to='stiftung.verwaltungskosten',
+                verbose_name='Verwaltungskosten / Rechnung',
+            ),
+        ),
+    ]