feat: return human-readable status text in Order API

- Replace ReadOnlyField with SerializerMethodField for status
- Add get_status method to return display text (e.g., Completed instead of CO)
- Improve API usability with meaningful status labels
- Make order status more user-friendly for frontend consumption

Author: Yosef-AlSabbah

orders/serializers.py

@@ -34,14 +34,17 @@ class Meta:
         decimal_places=2,
         read_only=True
     )
-    status = serializers.ChoiceField(choices=Order.Status.choices)
+    status = serializers.SerializerMethodField()
 
     class Meta:
         model = Order
         fields = ['order_id', 'user', 'quantity', 'order_date', 'order_items', 'original_price', 'total_price',
                   'coupon', 'discount', 'status']
         read_only_fields = ['user', 'order_date']
 
+    def get_status(self, obj):
+        return obj.get_status_display()
+
     def update(self, instance, validated_data):
         # Check if status is in the incoming data and the user is allowed to update it
         request = self.context.get('request')