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

backend/server/adventures/migrations/0021_alter_attachment_name.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.0.8 on 2025-01-19 22:32
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('adventures', '0020_attachment_name'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='attachment',
+            name='name',
+            field=models.CharField(blank=True, max_length=200, null=True),
+        ),
+    ]