- schema: add ToRAMStatus and USBExportPath fields to RuntimeHealth
- platform/runtime.go: collectToRAMHealth (ok/warning/failed based on
IsLiveMediaInRAM + toramActive) and collectUSBExportHealth (scans
/proc/mounts + lsblk for writable USB-backed filesystems)
- pages.go: add USB Export Drive and LiveCD in RAM rows to the health table
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>