fix(search): query_analyzer가 setup_logger 사용하도록 수정

기본 logging.getLogger()는 WARNING 레벨이라 prewarm/analyze 진행 로그가
stdout/파일 어디에도 안 찍혔음. setup_logger("query_analyzer")로 교체하면
logs/query_analyzer.log + stdout 둘 다 INFO 레벨 출력.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/services/search/query_analyzer.py

@@ -29,14 +29,14 @@ from __future__ import annotations
 
 import asyncio
 import hashlib
-import logging
 import time
 from typing import Any
 
 from ai.client import AIClient, _load_prompt, parse_json_response
 from core.config import settings
+from core.utils import setup_logger
 
-logger = logging.getLogger("query_analyzer")
+logger = setup_logger("query_analyzer")
 
 # ─── 상수 (plan 영구 룰) ────────────────────────────────
 PROMPT_VERSION = "v2"  # prompts/query_analyze.txt 축소판