Fix: [2.0.1] Nginx rewrite에 맞게 FastAPI 라우트 prefix 제거

Nginx가 /api/news/ prefix를 strip하므로 FastAPI 라우트를
/api/news/summarize → /summarize, /api/news/health → /health로 수정

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

app/main.py

@@ -14,7 +14,7 @@ class SummarizeRequest(BaseModel):
     title: str = ""
 
 
-@app.post("/api/news/summarize")
+@app.post("/summarize")
 async def summarize_video(
     req: SummarizeRequest,
     x_api_secret: str = Header(default=""),
@@ -31,6 +31,6 @@ async def summarize_video(
     return {"status": "ok", "title": title, "summary_length": len(summary)}
 
 
-@app.get("/api/news/health")
+@app.get("/health")
 async def health():
     return {"status": "ok"}