This update modifies the Client model fields and introduces new data validation methods. Key changes include removing the hard-coded phone region and adding validation for email and short codes.
**New Features**
- Added `validate_email` method to ensure proper email formatting
- Added `validate_short_code` method to enforce alphanumeric short codes
**Enhancements & Refinements**
- Removed hard-coded 'NP' region from `phone` field to support international numbers
sankalp