Fix: [2.0.10] 라이브/쇼츠 스킵 및 네트워크 타임아웃 설정

- 라이브/쇼츠 영상 감지 시 에러 대신 스킵 처리
- yt-dlp socket_timeout, httpx timeout, Discord webhook timeout 30초로 설정

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

app/discord.py

@@ -104,7 +104,7 @@ async def send_to_discord(title: str, video_url: str, summary: str) -> None:
 
     payload = {"embeds": [embed]}
 
-    async with httpx.AsyncClient() as client:
+    async with httpx.AsyncClient(timeout=30.0) as client:
         resp = await client.post(settings.discord_webhook_url, json=payload)
         resp.raise_for_status()
 
@@ -131,5 +131,5 @@ async def send_error_to_discord(
 
     payload = {"embeds": [embed]}
 
-    async with httpx.AsyncClient() as client:
+    async with httpx.AsyncClient(timeout=30.0) as client:
         await client.post(settings.discord_webhook_url, json=payload)