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Send the selected remote together with virtual-channel audio requests and use per-rig stream info when /audio is opened with channel_id. This keeps browser channel audio aligned with the requested remote after the recent multi-rig client changes. Add coverage for parsing channel_id together with remote. Co-authored-by: OpenAI Codex <noreply@openai.com> Signed-off-by: Stan Grams <sjg@haxx.space>