Bug: existing devices registered before Frontend started sending x-device-name/
x-device-model/x-device-os headers stayed with NULL fields forever — DeviceLimit
sheet shows only platform label ("iPhone" without iOS version, no name).
Fix:
- touchDevice() now accepts optional { name, model, osVersion } and updates
these fields when headers are provided (existing-row backfill).
- requireUser auth middleware reads URL-encoded x-device-* headers + passes
them to both touchDevice() (existing) and registerDevice() (auto-register).
After deploy: next authenticated request from updated client backfills the
device record automatically (throttled per TOUCH_THROTTLE_MS = 1×/min).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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