feat: implement attachment management with upload, delete, and permission checks; update serializers and models

backend/server/adventures/migrations/0020_attachment_name.py

@@ -0,0 +1,19 @@
+# Generated by Django 5.0.8 on 2025-01-19 22:32
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('adventures', '0019_alter_attachment_file'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='attachment',
+            name='name',
+            field=models.CharField(default='', max_length=200),
+            preserve_default=False,
+        ),
+    ]