feat: 알림 채널 B방식 다중 발송 적용

backend/main.py

@@ -490,15 +490,6 @@ def get_notify_config_from_db(conn) -> dict:
         "alert_email_to":      os.getenv("ALERT_EMAIL_TO", ""),
     }
 
-def refresh_notifier(conn):
-    """활성화된 모든 채널 중 첫 번째 채널로 notifier 모듈 업데이트"""
-    import notifier
-    cfg = get_notify_config_from_db(conn)
-    notifier.DISCORD_WEBHOOK_URL = cfg["discord_webhook_url"]
-    notifier.GMAIL_USER          = cfg["gmail_user"]
-    notifier.GMAIL_APP_PASSWORD  = cfg["gmail_app_password"]
-    notifier.ALERT_EMAIL_TO      = cfg["alert_email_to"]
-
 @app.get("/api/admin/notify-channels")
 def list_notify_channels(token=Depends(require_admin), conn=Depends(get_db)):
     cur = conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor)
@@ -516,7 +507,6 @@ def create_notify_channel(data: NotifyChannel, token=Depends(require_admin), con
     """, (data.name, data.type, data.discord_webhook_url or "", data.gmail_user or "",
           data.gmail_app_password or "", data.alert_email_to or "", data.enabled))
     conn.commit()
-    refresh_notifier(conn)
     return cur.fetchone()
 
 @app.put("/api/admin/notify-channels/{channel_id}")
@@ -538,7 +528,6 @@ def update_notify_channel(channel_id: int, data: NotifyChannel, token=Depends(re
         """, (data.name, data.type, data.discord_webhook_url or "", data.gmail_user or "",
               data.alert_email_to or "", data.enabled, channel_id))
     conn.commit()
-    refresh_notifier(conn)
     return cur.fetchone()
 
 @app.delete("/api/admin/notify-channels/{channel_id}")
@@ -546,7 +535,6 @@ def delete_notify_channel(channel_id: int, token=Depends(require_admin), conn=De
     cur = conn.cursor()
     cur.execute("DELETE FROM notify_channels WHERE id=%s", (channel_id,))
     conn.commit()
-    refresh_notifier(conn)
     return {"ok": True}
 
 # ─── 하위호환: 기존 단일 설정 API ────────────────────────