feat(health): vital_signs_daily 日聚合表 + Entity + service

- 新增 vital_signs_daily 表迁移（带唯一索引 tenant+patient+device_type+date）
- 新增 SeaORM Entity（含 percentile_95 统计字段）
- 实现日聚合 service：从 hourly 聚合到 daily（支持 upsert）
- 实现 aggregate_daily_for_all_tenants 多租户遍历聚合
- 实现 query_daily 范围查询
- 单元测试：percentile 计算验证

crates/erp-health/src/entity/mod.rs

@@ -42,4 +42,5 @@ pub mod offline_event_registration;
 pub mod medication_record;
 pub mod medication_reminder;
 pub mod vital_signs;
+pub mod vital_signs_daily;
 pub mod vital_signs_hourly;

crates/erp-health/src/entity/vital_signs_daily.rs

@@ -0,0 +1,45 @@
+use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
+#[sea_orm(table_name = "vital_signs_daily")]
+pub struct Model {
+    #[sea_orm(primary_key, auto_increment = false)]
+    pub id: Uuid,
+    pub tenant_id: Uuid,
+    pub patient_id: Uuid,
+    pub device_type: String,
+    pub date_bucket: chrono::NaiveDate,
+    #[sea_orm(skip_serializing_if = "Option::is_none")]
+    pub min_val: Option<f64>,
+    #[sea_orm(skip_serializing_if = "Option::is_none")]
+    pub max_val: Option<f64>,
+    pub avg_val: f64,
+    pub sample_count: i32,
+    #[sea_orm(skip_serializing_if = "Option::is_none")]
+    pub percentile_95: Option<f64>,
+    pub created_at: DateTimeUtc,
+    pub updated_at: DateTimeUtc,
+    pub version: i32,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {
+    #[sea_orm(
+        belongs_to = "super::patient::Entity",
+        from = "Column::PatientId",
+        to = "super::patient::Column::Id"
+    )]
+    Patient,
+}
+
+impl Related<super::patient::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::Patient.def()
+    }
+    fn via() -> Option<RelationDef> {
+        None
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}