feat(account): update unique constraints for User model

- Modified the unique_together constraint for the User model to only require uniqueness on the email field, removing device_id from the constraints.
- Added a migration to apply this change to the database schema.

apps/account/migrations/0005_alter_user_unique_together.py

@@ -0,0 +1,17 @@
+# Generated by Django 3.2.4 on 2025-09-22 17:18
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('account', '0004_alter_user_avatar'),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name='user',
+            unique_together={('email',)},
+        ),
+    ]

apps/account/models/user.py

@@ -199,7 +199,7 @@ class User(AbstractUser):
         verbose_name = "All Users"
         verbose_name_plural = "All Users"
         unique_together = (
-            'email', 'device_id'
+            'email', 
         )