WIP Add sandbox name validation with DNS label compliance

[dbmikus]

Summary

This PR adds comprehensive validation for sandbox names to ensure they comply with DNS label requirements and maintain consistency across the system.

Key Changes

• Added ValidateName() function in internal/sandbox/names.go that validates sandbox names against the following rules:

  • Must not be empty
  • Must be at most 63 characters (DNS label limit)
  • Must contain only lowercase letters, numbers, and hyphens
  • Cannot have leading, trailing, or consecutive hyphens

• Added regex pattern validation using namePattern to enforce the allowed character set and hyphen placement rules

• Added MaxNameLength constant set to 63 to match DNS label specifications

• Integrated validation into CreateSandbox() in pkg/amika/service.go to validate user-provided sandbox names before creation

• Added comprehensive test coverage in internal/sandbox/names_test.go:

  • TestValidateName() validates both valid and invalid name formats
  • TestGenerateNameIsValid() ensures auto-generated names always pass validation

Implementation Details

• The validation uses a regex pattern ^[a-z0-9]+(-[a-z0-9]+)*$ to ensure hyphens only appear between alphanumeric segments
• Validation is applied to user-provided names in the service layer, returning ErrInvalidArgument on failure
• Auto-generated names (color-city format) are guaranteed to be valid by design

https://claude.ai/code/session_01TND4LDP6AZGUbi92edwe14