Add JetStream sync CLI and client
Introduce a JetStreamClient implementation and a new sync command
(apps/cli/src/cmd/sync.ts), add structured logging via @logtape/logtape,
and wire a logger into the CLI context. Remove the old @atcute/jetstream
dependency and add @logtape/logtape. Simplify scrobble CLI to a stub and
adjust schema imports to .js. Fix the now-playing query to select the
latest scrobble per user using DISTINCT ON.
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