Fix: [3.0.1] 응답에 video_url/channel_name 포함 + 요약 프롬프트 개선

- API 응답에 video_url, channel_name을 항상 포함 (n8n Switch 이후 사용)
- channel_name 필드를 request body에서 받아 그대로 반환
- 요약 프롬프트: 구체적 수치/사례 포함, 메타 서술 금지, 시청자 액션 제시
- 문서 전체 API 응답 형식 업데이트

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/main.py

@@ -11,6 +11,7 @@ app = FastAPI(title="News Summary Bot")
 class SummarizeRequest(BaseModel):
     video_url: str
     title: str = ""
+    channel_name: str = ""
 
 
 @app.post("/summarize")
@@ -23,21 +24,24 @@ async def summarize_video(
 
     title = req.title or "제목 없음"
 
+    channel_name = req.channel_name or ""
+    base = {"video_url": req.video_url, "title": title, "channel_name": channel_name}
+
     try:
         video_id = extract_video_id(req.video_url)
         transcript = fetch_transcript(video_id)
         summary = summarize(transcript, title)
     except SkipVideo as e:
-        return {"status": "skipped", "title": title, "reason": str(e)}
+        return {**base, "status": "skipped", "reason": str(e)}
     except Exception as e:
         return {
+            **base,
             "status": "error",
-            "title": title,
             "error_type": type(e).__name__,
             "error_message": str(e),
         }
 
-    return {"status": "ok", "title": title, "summary": summary}
+    return {**base, "status": "ok", "summary": summary}
 
 
 @app.get("/health")