Add wallet balance to User model and implement Atoll/Island management

- Added `wallet_balance` field to the User model.
- Updated UserAdmin to include `wallet_balance` in the admin interface.
- Created serializers and views for Atoll and Island management.
- Implemented endpoints for listing, creating, and updating Atolls and Islands.
- Enhanced payment processing with UUIDs for Payment and Topup models.
- Added migration files for new fields and constraints.
- Improved error handling and validation in various views.
- Updated email templates for better responsiveness and SEO.

api/serializers.py

@@ -1,6 +1,6 @@
 from knox.models import AuthToken
 from django.contrib.auth import authenticate
-from api.models import User
+from api.models import User, Atoll, Island
 
 from rest_framework import serializers
 
@@ -46,7 +46,6 @@ class CustomReadOnlyUserSerializer(serializers.ModelSerializer):
             "username",
             "mobile",
             "address",
-
         )
 
 
@@ -92,3 +91,15 @@ class KnoxTokenSerializer(serializers.ModelSerializer):
     class Meta:  # type: ignore
         model = AuthToken
         fields = "__all__"
+
+
+class AtollSerializer(serializers.ModelSerializer):
+    class Meta:  # type: ignore
+        model = Atoll
+        fields = "__all__"
+
+
+class IslandSerializer(serializers.ModelSerializer):
+    class Meta:  # type: ignore
+        model = Island
+        fields = "__all__"