feat: 支持知识库导入 PPTX 与 XLSX 文档

- 打通 Office 文档桥接解析、解析进度承接与图片引用改写

- 落地 PPTX 按页分块、XLSX 行窗口分块以及预览与检索渲染闭环

easyflow-api/easyflow-api-public/src/main/java/tech/easyflow/publicapi/controller/PublicKnowledgeShareController.java

@@ -638,6 +638,10 @@ public class PublicKnowledgeShareController {
         for (com.easyagents.core.document.Document document : documents) {
             KnowledgeSearchResultItem item = new KnowledgeSearchResultItem();
             item.setContent(document.getContent());
+            Object renderMarkdown = document.getMetadata("renderMarkdown");
+            item.setRenderMarkdown(renderMarkdown == null ? null : String.valueOf(renderMarkdown));
+            Object sourceFileName = document.getMetadata("sourceFileName");
+            item.setSourceFileName(sourceFileName == null ? null : String.valueOf(sourceFileName));
             item.setScore(document.getScore());
             Object hitSource = document.getMetadata("hitSource");
             item.setHitSource(hitSource == null ? null : String.valueOf(hitSource));