feat(health): 透析方案管理 CRUD — dialysis_prescription 全栈

新增透析方案实体和完整 CRUD：
- Entity: 20 字段含抗凝/血管通路/透析参数
- DTO: f64 类型适配 utoipa ToSchema
- Service: 抗凝类型 + 血管通路类型校验
- Handler: 5 端点 + RBAC 权限控制
- 路由: /api/v1/health/dialysis-prescriptions

crates/erp-health/src/error.rs

@@ -74,6 +74,9 @@ pub enum HealthError {
     #[error("告警记录不存在")]
     AlertNotFound,
 
+    #[error("透析方案不存在")]
+    DialysisPrescriptionNotFound,
+
     #[error("状态转换无效: {0}")]
     InvalidStatusTransition(String),
 
@@ -109,7 +112,8 @@ impl From<HealthError> for AppError {
             | HealthError::ThresholdNotFound
             | HealthError::ConsentNotFound
             | HealthError::AlertRuleNotFound
-            | HealthError::AlertNotFound => AppError::NotFound(err.to_string()),
+            | HealthError::AlertNotFound
+            | HealthError::DialysisPrescriptionNotFound => AppError::NotFound(err.to_string()),
             HealthError::ScheduleFull => AppError::Validation(err.to_string()),
             HealthError::InvalidStatusTransition(s) => AppError::Validation(s),
             HealthError::VersionMismatch => AppError::VersionMismatch,