fix(docker): run official bot (dave/bot.mjs) in container, not selfbot join.mjs

The `join` entrypoint command now execs `node dave/bot.mjs` and forwards args;
Dockerfile comments/env notes updated from DISCORD_SELFBOT_TOKEN to the official
bot path. Rebuilt watch_sceen_ai:test on .9 and verified in-container:
  * smoke -> 4 passed
  * voice -> eyes-free mock loop runs
  * join  -> LIVE bot join (테스트봇#9029) to guild 사지방 / channel 일반, Ready, clean leave

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Dockerfile

@@ -3,7 +3,7 @@
 # Bundles everything the current M1 milestone needs:
 #   * CUDA runtime (so future faster-whisper / TTS can use the GPU)
 #   * Python 3.11 (STT/TTS asset compat per README) for the wsai voice pipeline
-#   * Node 22 + ffmpeg for the dave/ selfbot voice joiner (DAVE/MLS E2EE)
+#   * Node 22 + ffmpeg for the dave/ official-bot voice joiner (DAVE/MLS E2EE)
 #
 # STT/TTS/Brain are still mock at this milestone, so nothing GPU-heavy runs yet;
 # the image is built GPU-capable so the next milestones drop straight in.
@@ -40,7 +40,7 @@ COPY requirements.txt PLAN.md README.md ./
 COPY docker-entrypoint.sh /usr/local/bin/entrypoint
 RUN chmod +x /usr/local/bin/entrypoint
 
-# .env (DISCORD_SELFBOT_TOKEN) is NOT baked in — mount it at runtime:
+# .env (DISCORD_BOT_TOKEN) is NOT baked in — mount it at runtime:
 #   -v $(pwd)/.env:/app/.env:ro
 ENTRYPOINT ["entrypoint"]
 CMD ["smoke"]