Add comprehensive unit tests and documentation for profiles service

[privateip]

• Add missing unit tests for ProfileService methods:

  • GetActiveProfile() with success and not found scenarios
  • Create() with proper HTTP status code handling
  • Delete() with success and not found scenarios
  • Import() with complete profile configuration
  • Export() with success and not found scenarios
  • NewProfile() helper function validation

• Add comprehensive Go documentation for all types and methods:

  • Package-level documentation explaining IAP profiles
  • Detailed struct field documentation for Profile, UIProperties, etc.
  • Method documentation with parameters, returns, and error conditions
  • Usage notes and behavioral explanations

• All tests pass with proper error handling and fixture usage

• Documentation follows Go conventions and is viewable with 'go doc'