feat(login): 登录日志要体现用哪个backend登录的 #4472 (#5199)

Co-authored-by: xinwen <coderWen@126.com>

apps/audits/migrations/0011_userloginlog_backend.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.1 on 2020-12-09 03:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('audits', '0010_auto_20200811_1122'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='userloginlog',
+            name='backend',
+            field=models.CharField(default='', max_length=32, verbose_name='Login backend'),
+        ),
+    ]