feat(health): 新增公开文章列表端点 /public/articles 供小程序访客首页使用

访客首页文章列表调用 /health/articles 需要 JWT 认证导致 401。
新增 GET /public/articles?tenant_id=xxx 端点，强制只返回已发布文章，
无需认证。小程序访客首页改用此公开端点。

crates/erp-health/src/handler/article_handler.rs

@@ -48,6 +48,30 @@ where
     Ok(Json(ApiResponse::ok(result)))
 }
 
+pub async fn list_public_articles(
+    State(state): State<HealthState>,
+    Query(params): Query<ArticleListParams>,
+) -> Result<Json<ApiResponse<PaginatedResponse<ArticleListItem>>>, AppError> {
+    let tenant_id = params
+        .tenant_id
+        .ok_or_else(|| AppError::Validation("tenant_id is required".into()))?;
+    let page = params.page.unwrap_or(1);
+    let page_size = params.page_size.unwrap_or(20);
+    let result = article_service::list_articles(
+        &state,
+        tenant_id,
+        page,
+        page_size,
+        params.category,
+        Some("published".to_string()),
+        params.category_id,
+        params.tag_id,
+        params.keyword,
+    )
+    .await?;
+    Ok(Json(ApiResponse::ok(result)))
+}
+
 pub async fn get_article<S>(
     State(state): State<HealthState>,
     Extension(ctx): Extension<TenantContext>,