Adds a dashboard<->bot control plane (bot pushes state + polls commands, keeping
the bot's single outbound-HTTP direction):
- New bot_control.BotControl + endpoints: GET /api/bot/state, /api/bot/commands;
POST /api/bot/report, /api/bot/select.
- Dashboard header bar: bot identity/connection, server dropdown (top "없음"),
voice-channel dropdown (top "없음"), and live participant list.
- Turns record who spoke (Turn.speaker, via X-User-Name on the voice-turn POST).
- dave/bot.mjs: reports identity/guilds/voice-channels/members, polls join/leave
commands and joins dynamically, and sends the speaker's display name.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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