Phase 1: Register routes that were defined but never connected
- Add GET/PUT /api/system/config routes (admin-only) for system
configuration in new internal/router/system.go
- Add GET /api/devices/:id/sidecar routes for device sidecar config
- Add SidecarHandler to router Config struct
- Instantiate SidecarHandler in main.go with config for fallback support
These routes were implemented in handlers/sidecar.go but never registered,
breaking the ability to configure base URLs for device sync.
john-okeefe
5451e82b2d