feat: configure SP certificate and private key via SAMLConfiguration (#1531)

saml_auth/migrations/0002_samlconfiguration_sp_cert_and_more.py

@@ -0,0 +1,23 @@
+# Generated by Django 5.2.6 on 2026-05-31 12:40
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('saml_auth', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='samlconfiguration',
+            name='sp_cert',
+            field=models.TextField(blank=True, help_text='SP x509cert (PEM). Optional; required if SP private key is set.', null=True),
+        ),
+        migrations.AddField(
+            model_name='samlconfiguration',
+            name='sp_private_key',
+            field=models.TextField(blank=True, help_text='SP private key (PEM). Optional; required if SP certificate is set.', null=True),
+        ),
+    ]