The remote-dl client sends exact_lang in dl_params, and REST download jobs set it in the service ctx, so a service can skip the manifests of close-match languages.
Remote sessions now carry -l/-vl/-al/-a/-fs under a nested dl_params, so services fetch the requested audio versions. Server-account tokens for non-default accounts move from default to the account name, so each account logs in once after upgrade.
serve.server_accounts lends region-tagged server credentials to remote sessions (round-robin per region, per-key opt-in, per-account cache). Remote sessions no longer fall back to the server's local credentials when the client sends none.
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