P1.9: loadDeviceSettings / loadBlacklist / saveBlacklist / saveDeviceSettings
+ itemToManifestEntry were duplicated across popup-only.ts and
content-callable.ts. Lifts the four storage helpers into service-worker/
storage.ts and itemToManifestEntry into service-worker/vault.ts.
Both router files now import from one home each. Adds storage.test.ts
covering round-trips and defaults.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
