demos: tour the full AppView read-query API in every SDK
Each demo now shows a typed DateInterval chart (top tracks this week), the
album catalog + a tracklist drill-down, an actor's loved songs + follow graph,
and the universal get(nsid, params) escape hatch — not just global stats + top
tracks. Pins bumped to the new SDK versions (rust 0.2, ts/py/rb 0.5, kotlin
0.6, gleam 1.5, clojure 0.5.0-SNAPSHOT).
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