fix: 全面修复 - 实时通讯、报告AI流程、健康概览、用药运动提醒

- SignalR Hub消息持久化+防重复+跨端广播
- 报告VLM+LLM真实AI流程(验证→提取→解读)
- 医生审核页重构(严重程度/建议模板/综合评语)
- 健康概览五合一趋势图(fl_chart+指标切换)
- 用药提醒时区修复+跨午夜+过期提醒
- 运动打卡DayOfWeek映射修复+计划覆盖查询
- 体重与其他四指标同级(Abnormal检查/确认卡牌)
- AI Agent支持多种类多时段批量录入
- 删除硬编码假数据(张三/假医生/假AI解读)
- 随访/报告审核数据链路全部打通

backend/src/Health.Domain/Entities/report.cs

@@ -17,7 +17,9 @@ public sealed class Report
     [Column(TypeName = "jsonb")]
     public string? AiIndicators { get; set; }      // JSONB: [{name, value, unit, range, status}]
     public ReportStatus Status { get; set; }
-    public string? DoctorComment { get; set; }     // 医生审核意见
+    public string? Severity { get; set; }           // 严重程度：Normal/Abnormal/Severe/Critical
+    public string? DoctorComment { get; set; }       // 医生审核意见
+    public string? DoctorRecommendation { get; set; } // 医生建议（用药/复查/生活方式）
     public string? DoctorName { get; set; }
     public DateTime? ReviewedAt { get; set; }
     public DateTime CreatedAt { get; set; } = DateTime.UtcNow;