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feat: migrate UpdateUser API to Connect RPC with comprehensive testing

- Add UpdateUser function to Connect RPC with email upsert logic
- Add ErrEmailConflict error constant for email validation
- Preserve all business logic including metadata validation and audit logging
- Add comprehensive test suite with 5 test cases covering all scenarios
- Enhance test script with before/after diff display for user updates
- Add silent mode to GetUser API for integration testing
- Update documentation with UpdateUser API usage examples
- Smart workflow integration with CreateUser → UpdateUser testing