Add Promise deduplication (request coalescing) to the `getAssetInfo`
method in `ImmichClient` (`lib/immich.ts`) to prevent concurrent
identical requests from firing multiple times to the Immich server.
This is particularly helpful when calling `Promise.all` on multiple
assets concurrently (e.g. hero images on the homepage or multiple
album cover placeholder hashes).
Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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