test(health): 文章/分类/标签集成测试 — 10 个用例全通过

覆盖文章 CRUD、状态流(draft→pending_review→published→draft)、
拒绝与重提交、列表过滤、软删除、租户隔离、分类 CRUD+隔离、
标签 CRUD+文章关联、乐观锁冲突。

crates/erp-server/tests/integration.rs

@@ -28,3 +28,5 @@ mod health_follow_up_tests;
 mod health_consultation_tests;
 #[path = "integration/health_data_tests.rs"]
 mod health_data_tests;
+#[path = "integration/health_article_tests.rs"]
+mod health_article_tests;