feat(core): 新增 HealthDataProvider trait + DTO 定义

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

crates/erp-core/src/lib.rs

@@ -3,6 +3,7 @@ pub mod audit_service;
 pub mod entity;
 pub mod error;
 pub mod events;
+pub mod health_provider;
 pub mod module;
 pub mod rbac;
 pub mod sanitize;