Fills in all 7 previously-unimplemented note methods in SqliteInterface
and ApiInterface, adds cast/query helpers for notes, and fixes the
apirouter (missing updatenote validator, two /user/ → /users/ typos that
were also bypassing auth middleware).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
codingetandClaude