fix: configure CI database connection properly

- Add dotenv loading to Django settings
- Update CI workflow to use correct environment variables
- Set POSTGRES_* variables instead of DATABASE_URL
- Add environment variables to all Django management commands
- Fixes CI test failures due to database connection issues

check_orphaned_templates.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+import os
+import django
+
+# Setup Django environment
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'core.settings')
+django.setup()
+
+from stiftung.models import UnterstuetzungWiederkehrend, DestinataerUnterstuetzung
+
+# Find orphaned templates
+orphaned = []
+for template in UnterstuetzungWiederkehrend.objects.all():
+    count = DestinataerUnterstuetzung.objects.filter(wiederkehrend_von=template).count()
+    if count == 0:
+        orphaned.append((template, count))
+
+print(f'Verwaiste Vorlagen gefunden: {len(orphaned)}')
+if orphaned:
+    print('Details:')
+    for template, count in orphaned[:10]:  # Show first 10
+        print(f'- ID {template.id}: {template.destinataer} - {template.beschreibung} ({template.betrag}€)')
+else:
+    print('Keine verwaisten Vorlagen!')
+
+# Also show all templates with their payment counts
+print('\n--- Alle wiederkehrende Vorlagen ---')
+all_templates = UnterstuetzungWiederkehrend.objects.all()
+for template in all_templates[:10]:  # Show first 10
+    count = DestinataerUnterstuetzung.objects.filter(wiederkehrend_von=template).count()
+    status = "VERWAIST" if count == 0 else f"{count} Zahlungen"
+    print(f'ID {template.id}: {template.destinataer} - {template.beschreibung} ({template.betrag}€) - {status}')