feat: add comprehensive GitHub workflow and development tools

app/stiftung/migrations/0014_dokumentlink_rentmeister_id.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.0.6 on 2025-08-26 08:15
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stiftung', '0013_alter_verwaltungskosten_status'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='dokumentlink',
+            name='rentmeister_id',
+            field=models.UUIDField(blank=True, null=True, verbose_name='Rentmeister ID'),
+        ),
+    ]