feat(health): 随访模板系统 — follow_up_template + template_field 全栈

新增随访模板和模板字段两张表及完整 CRUD：
- 迁移 083: follow_up_template + follow_up_template_field
- Entity: 模板(名称/类型/适用范围/状态) + 字段(标签/键名/类型/选项/校验)
- DTO: 创建时内嵌字段列表、更新支持全量替换字段
- Service: 随访类型+字段类型校验、级联软删除
- Handler: 5 端点 + RBAC 权限
- 路由: /api/v1/health/follow-up-templates

crates/erp-health/src/error.rs

@@ -77,6 +77,9 @@ pub enum HealthError {
     #[error("透析方案不存在")]
     DialysisPrescriptionNotFound,
 
+    #[error("随访模板不存在")]
+    FollowUpTemplateNotFound,
+
     #[error("状态转换无效: {0}")]
     InvalidStatusTransition(String),
 
@@ -113,7 +116,8 @@ impl From<HealthError> for AppError {
             | HealthError::ConsentNotFound
             | HealthError::AlertRuleNotFound
             | HealthError::AlertNotFound
-            | HealthError::DialysisPrescriptionNotFound => AppError::NotFound(err.to_string()),
+            | HealthError::DialysisPrescriptionNotFound
+            | HealthError::FollowUpTemplateNotFound => AppError::NotFound(err.to_string()),
             HealthError::ScheduleFull => AppError::Validation(err.to_string()),
             HealthError::InvalidStatusTransition(s) => AppError::Validation(s),
             HealthError::VersionMismatch => AppError::VersionMismatch,