Add stub implementations for:
- library.go: Library management routes (admin + user visibility)
- device.go: Device registration and management routes
- router.go: Updated to import jwt package
Router package structure is complete with all route groups defined.
Next step: Incrementally migrate routes from main.go by calling
router.RegisterRoutes() and removing duplicate definitions.
All verification checks pass (26/26).
john-okeefe
2dd0238ef2