health_score: number
analysis:
  temperature_ok: boolean
  heart_rate_ok: boolean
  steps_ok: boolean
  issues: array
level: string  # "normal" 或 "alert"

status: string
report:
  score: number
  level: string          # "优秀" / "良好" / "需改善"
  summary: string
  recommendations: array
  alerts: array          # 仅当 level="alert" 时
timestamp: string