feat(认证): 添加用户登录和注销功能

添加用户认证功能，包括登录页面、视图逻辑和模板
配置登录URL设置并保护首页视图需要认证
在导航栏添加登录状态显示和操作按钮

core/migrations/0007_alter_insightrecord_speaker.py

@@ -0,0 +1,19 @@
+# Generated by Django 5.1.4 on 2026-01-28 10:34
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0006_add_summary'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='insightrecord',
+            name='speaker',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='core.familymember', verbose_name='发言人'),
+        ),
+    ]