fix: deterministic on-screen site search + lock replies to Korean

- Site-specified search ("네이버에서 X 검색해줘") now runs controlBrowser.search
  directly in the engine when broadcasting, instead of relying on the 3B model
  to emit the tool call (it kept narrating "검색하겠습니다" without acting).
- Set OUTPUT_LANGUAGE=ko so replies are Korean-only — stops the small model
  leaking CJK/Hanja and English fragments (每, 朗, "feels like") into weather
  and other answers, and keeps them concise.

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

docker-compose.yml

@@ -71,7 +71,7 @@ services:
       # serialised under load and pushed TTS to 7-8s; GPU does ~0.3s/sentence.
       MELO_DEVICE: ${MELO_DEVICE:-cuda}
       # Optional single-language lock for replies (empty = user's own language).
-      OUTPUT_LANGUAGE: ${OUTPUT_LANGUAGE:-}
+      OUTPUT_LANGUAGE: ${OUTPUT_LANGUAGE:-ko}
       # Drop the pre-loop planner LLM call to cut voice-reply latency on small
       # hardware (the planner adds a full model round-trip per turn).
       PLANNER_ENABLED: ${PLANNER_ENABLED:-0}