feat(health): Track 3 医疗阈值 — warning 种子 + 患者端只读 API

- 新增 6 条 warning 级别阈值种子数据（血压/心率/血糖参考范围）
- 新增 GET /health/critical-value-thresholds/public 患者端只读接口
- 扩展 indicator 验证支持 blood_sugar_fasting/postprandial 等新指标

crates/erp-health/src/handler/critical_value_threshold_handler.rs

@@ -109,3 +109,16 @@ where
         .await?;
     Ok(Json(ApiResponse::ok(())))
 }
+
+/// 患者端只读接口 — 返回当前租户所有活跃阈值，仅需认证。
+pub async fn list_public_thresholds<S>(
+    State(state): State<HealthState>,
+    Extension(ctx): Extension<TenantContext>,
+) -> Result<Json<ApiResponse<Vec<crate::entity::critical_value_threshold::Model>>>, AppError>
+where
+    HealthState: FromRef<S>,
+    S: Clone + Send + Sync + 'static,
+{
+    let list = critical_value_threshold_service::find_thresholds(&state.db, ctx.tenant_id).await?;
+    Ok(Json(ApiResponse::ok(list)))
+}