Adds a "🧠 모델 (STT · LLM)" collapsible panel with two dropdowns:
- STT(귀): tiny/base/small/medium/large-v3. Switching swaps WhisperSTT.model,
tears the worker down and re-warms it in the BACKGROUND (first switch to a
not-yet-downloaded size fetches it, so the HTTP call returns immediately and
the next utterance waits for the reload).
- LLM(두뇌): Haiku 4.5 / Sonnet 4.5. Applied on the next reply (no reload).
Backend: GET /api/models, POST /api/models/stt, POST /api/models/llm; Dashboard
gains models_settings/set_stt_model/set_llm_model. In-memory only (a service
restart reverts to the env defaults small / claude-haiku-4-5).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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