Local API for tools other than Streamer.bot.

The API is versioned under /v1 and defaults to binding on 127.0.0.1. Exposing it on the LAN will be an explicit setting.

Planned endpoints

Method	Path	Purpose
GET	/v1/printers	List printer instances
GET	/v1/printers/{id}	Instance identity and status
GET	/v1/printers/{id}/status	Live status snapshot
GET	/v1/printers/{id}/thumbnail	Optional job preview image
GET	/v1/printers/{id}/stream	Optional live stream / snapshot URLs
GET	/v1/plugins	Installed integrations and config schemas
WS	/v1/events	Push events for printer and job changes

OpenAPI will be published with the implementation so clients can generate SDKs.