fix(health): 允许已发布文章重新提交审核 — published → pending_review

状态机新增 published → pending_review 转换，
已发布文章编辑后可直接提交审核，无需先撤回。
审核期间旧版本继续对外展示，审核通过后覆盖发布。

crates/erp-health/src/service/article_service.rs

@@ -119,6 +119,20 @@ pub async fn list_articles(
     })
 }
 
+/// 获取已发布文章详情（公开端点，无需认证）
+pub async fn get_public_article(state: &HealthState, id: Uuid) -> HealthResult<ArticleResp> {
+    let model = article::Entity::find()
+        .filter(article::Column::Id.eq(id))
+        .filter(article::Column::DeletedAt.is_null())
+        .filter(article::Column::Status.eq("published"))
+        .one(&state.db)
+        .await?
+        .ok_or(HealthError::ArticleNotFound)?;
+
+    let tags = load_article_tags(state, model.id).await?;
+    Ok(full_model_to_resp(model, tags))
+}
+
 /// 获取文章详情（管理端可查看任意状态，非管理端仅已发布）
 pub async fn get_article(
     state: &HealthState,
@@ -146,7 +160,7 @@ pub async fn get_article(
 // 审核工作流
 // ---------------------------------------------------------------------------
 
-/// 提交审核: draft/rejected → pending_review
+/// 提交审核: draft/rejected/published → pending_review
 pub async fn submit_article(
     state: &HealthState,
     tenant_id: Uuid,

crates/erp-health/src/service/validation.rs

@@ -187,7 +187,7 @@ pub fn validate_article_status_transition(current: &str, new: &str) -> HealthRes
         "draft" => matches!(new, "pending_review"),
         "pending_review" => matches!(new, "published" | "rejected"),
         "rejected" => matches!(new, "pending_review"),
-        "published" => matches!(new, "draft"),
+        "published" => matches!(new, "draft" | "pending_review"),
         _ => false,
     };
     if allowed {
@@ -570,8 +570,8 @@ mod tests {
         assert!(validate_article_status_transition("published", "draft").is_ok());
     }
     #[test]
-    fn art_published_to_pending_fails() {
-        assert!(validate_article_status_transition("published", "pending_review").is_err());
+    fn art_published_to_pending_ok() {
+        assert!(validate_article_status_transition("published", "pending_review").is_ok());
     }
     #[test]
     fn art_same_status_ok() {