- Add Balance float64 field to Subscriber struct with JSON and GORM tags
- Set default value to 0 in database schema
- Align PlanID and Status field formatting
- Remove omitempty from Plan field in Subscriber model
- Update NotifySubscriberUpdate to use any instead of interface{}
- Update sendDeactivationRequest parameter type from interface{} to any
- Reformat struct field alignment for improved readability
- Add SubscriberStatusInactive to SubscriberStatus enum
- Add blank lines after type declarations for consistency
- Adjust whitespace and alignment across all model structs