- 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.
Add Status field (gorm, indexed, default active) to both User and File models.
Add User status constants: StatusActive, StatusAdminDeleted.
Add File status constant: StatusUserDeleted.
Add tests verifying Status field is excluded from JSON serialization.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
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