新增依赖 highlightjs 代码文件预览高亮支持

server/src/main/java/cn/keking/service/FilePreview.java

@@ -17,6 +17,7 @@ public interface FilePreview {
     String TIFF_FILE_PREVIEW_PAGE = "tiff";
     String OFFICE_PICTURE_FILE_PREVIEW_PAGE = "officePicture";
     String TXT_FILE_PREVIEW_PAGE = "txt";
+    String CODE_FILE_PREVIEW_PAGE = "code";
     String EXEL_FILE_PREVIEW_PAGE = "html";
     String XML_FILE_PREVIEW_PAGE = "xml";
     String MARKDOWN_FILE_PREVIEW_PAGE = "markdown";