- refactor: move HTTP status and DTO concerns out of model and service
layers into API and handler code.
- feat: add admin service boundary and route auth through services
instead of direct repository access.
- test: add architecture and error tests covering package boundaries,
redaction, and service behavior.
- docs: record the protocol-neutral boundary decision and update
architecture and roadmap notes.
- Initialize slog in the serve command with terminal/file support
- Introduce `AppError` with HTTP status for unified service-layer errors
- Replace ad-hoc `api.Error` calls with `api.RespondError`
- Wrap internal errors with `model.NewInternalError` and add reference
IDs
- Add `RequestID` middleware and switch router from `gin.Default` to
`gin.New`
ld