fix(music-lab): market API 타입 강화·ANTHROPIC_API_KEY call-time·HTTP 레이어 테스트 추가

music-lab/app/market.py

@@ -8,8 +8,6 @@ from .db import (
     insert_market_trends, upsert_trend_report,
 )
 
-ANTHROPIC_API_KEY = os.getenv("ANTHROPIC_API_KEY", "")
-
 GENRE_PROMPTS: Dict[str, str] = {
     "lo-fi":   "lo-fi hip hop, chill, relaxing beats, study music, 85 BPM, jazzy chords",
     "phonk":   "dark phonk, aggressive 808 bass, Memphis trap, distorted synths, 140 BPM",
@@ -71,14 +69,15 @@ def _build_report(trends: List[Dict[str, Any]], report_date: str) -> Dict[str, A
 
 
 def _generate_insights(top_genres: list, top_keywords: list) -> str:
+    api_key = os.getenv("ANTHROPIC_API_KEY", "")
     if not top_genres:
         return "아직 수집된 트렌드 데이터가 없습니다."
-    if not ANTHROPIC_API_KEY:
+    if not api_key:
         names = ", ".join(g["genre"] for g in top_genres[:3])
         return f"이번 주 인기 장르: {names}. 해당 장르 중심 제작을 추천합니다."
 
     import anthropic
-    client = anthropic.Anthropic(api_key=ANTHROPIC_API_KEY)
+    client = anthropic.Anthropic(api_key=api_key)
     genre_str = ", ".join(f"{g['genre']}({g['score']:.1f})" for g in top_genres[:5])
     kw_str    = ", ".join(top_keywords[:10])
     try: