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/0049_phase3_email_dms_m2m.py

@@ -0,0 +1,33 @@
+# Generated by Django 5.0.6 on 2026-03-12 08:11
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stiftung', '0048_phase3_dms_dokument_datei'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='destinataeremaileingang',
+            name='dokument_dateien',
+            field=models.ManyToManyField(blank=True, help_text='Automatisch befüllte Anhänge als Django-DMS-Dateien.', related_name='email_eingaenge', to='stiftung.dokumentdatei', verbose_name='DMS-Dokumente (Anhänge)'),
+        ),
+        migrations.AlterField(
+            model_name='appconfiguration',
+            name='category',
+            field=models.CharField(choices=[('paperless', 'Paperless Integration'), ('email', 'E-Mail / IMAP'), ('general', 'General Settings'), ('corporate', 'Corporate Identity'), ('notifications', 'Notifications'), ('system', 'System Settings')], default='general', max_length=50, verbose_name='Category'),
+        ),
+        migrations.AlterField(
+            model_name='appconfiguration',
+            name='setting_type',
+            field=models.CharField(choices=[('text', 'Text'), ('password', 'Password'), ('number', 'Number'), ('boolean', 'Boolean'), ('url', 'URL'), ('tag', 'Tag Name'), ('tag_id', 'Tag ID')], default='text', max_length=20, verbose_name='Type'),
+        ),
+        migrations.AlterField(
+            model_name='destinataeremaileingang',
+            name='paperless_dokument_ids',
+            field=models.JSONField(blank=True, default=list, help_text='Veraltet – wird nach vollständiger Migration entfernt. Neue Anhänge in dokument_dateien.', verbose_name='Paperless Dokument-IDs (Anhänge, veraltet)'),
+        ),
+    ]