feat: add option to mark a rescue org to be in active communication

That enables to filter them out from a check without forgetting there are to-dos. Most often this will be used when you want to call a rescue org but they can currently not be reached

src/fellchensammlung/migrations/0055_rescueorganization_ongoing_communication_and_more.py

@@ -0,0 +1,25 @@
+# Generated by Django 5.2.1 on 2025-07-13 10:54
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('fellchensammlung', '0054_alter_notification_comment'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='rescueorganization',
+            name='ongoing_communication',
+            field=models.BooleanField(default=False, help_text='Es findet gerade Kommunikation zwischen Notfellchen und der Organisation statt.', verbose_name='In aktiver Kommunikation'),
+        ),
+        migrations.AlterField(
+            model_name='notification',
+            name='user_to_notify',
+            field=models.ForeignKey(help_text='Useraccount der Benachrichtigt wird', on_delete=django.db.models.deletion.CASCADE, related_name='user', to=settings.AUTH_USER_MODEL, verbose_name='Empfänger*in'),
+        ),
+    ]