更新 .gitignore 并刷新缓存

core/migrations/0004_systemconfig_sender_email.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.1.4 on 2026-01-18 10:50
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0003_readingrecord_note'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='systemconfig',
+            name='sender_email',
+            field=models.EmailField(blank=True, max_length=254, null=True, verbose_name='发件人邮箱'),
+        ),
+    ]