opencode 로 바꾸고 작업전 커밋

mcp-server/worker/rag_worker.py

@@ -105,7 +105,7 @@ async def _ask_llm(question: str, context: str = "") -> str:
         prompt = question
     
     response = await client.chat.completions.create(
-        model=VLLM_MODEL,
+        model="Qwen3.6-27B-FP8",
         messages=[
             {"role": "system", "content": "You are a helpful assistant."},
             {"role": "user", "content": prompt},