feat: 多用户系统改造（数据模型 + 认证 API）

backend/diary/migrations/0008_remove_comment_created_by_comment_user_and_more.py

@@ -0,0 +1,54 @@
+# Generated by Django 4.2.11 on 2026-04-15 02:59
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('diary', '0007_comment_creativity_comment_efficiency_and_more'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='comment',
+            name='created_by',
+        ),
+        migrations.AddField(
+            model_name='comment',
+            name='user',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='comments', to=settings.AUTH_USER_MODEL, verbose_name='创建者'),
+        ),
+        migrations.AddField(
+            model_name='diaryentry',
+            name='user',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='diary_entries', to=settings.AUTH_USER_MODEL, verbose_name='用户'),
+        ),
+        migrations.AddField(
+            model_name='experience',
+            name='user',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='experiences', to=settings.AUTH_USER_MODEL, verbose_name='用户'),
+        ),
+        migrations.AddField(
+            model_name='task',
+            name='user',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='tasks', to=settings.AUTH_USER_MODEL, verbose_name='创建者'),
+        ),
+        migrations.AlterField(
+            model_name='diaryentry',
+            name='date',
+            field=models.DateField(verbose_name='日期'),
+        ),
+        migrations.AlterField(
+            model_name='task',
+            name='assigned_to',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='assigned_tasks', to=settings.AUTH_USER_MODEL, verbose_name='负责人'),
+        ),
+        migrations.AlterUniqueTogether(
+            name='diaryentry',
+            unique_together={('user', 'date')},
+        ),
+    ]