Parallelize Qobuz playlist track fetching by increasing the page size to 500 and processing remaining pages concurrently via `futures::try_join_all` with a configurable semaphore (default 3). Results are offset-sorted to preserve original order. Adds a `page_concurrency` configuration option, updates the API client initialization, and introduces the `futures` dependency. This reduces large playlist latency from ~1.6s to ~0.7s.
Eric Coissac
1d3a9379a1