- Add user field to apiTokenAuth struct
- Add WithAPITokenUser(token, user) method for custom username
- Default to "jsonrpc" when no user specified (backward compatible)
- Add tests for custom user and empty user scenarios
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add comprehensive tests for HTTP Basic Auth support:
- API token authentication (jsonrpc + token)
- Username/password authentication
- Verify no auth header when unconfigured
- Fluent configuration method chaining
- Auth overwrite behavior
The auth implementation was completed in the previous commit
as a dependency for JSON-RPC client.
Closes: kanboard-api-k33
