docs: add DeepWiki badge to README (#2883)

* feat: add switch for role election

* feat: classNotCass

* Update role election default and refactor TaskManager

Changed the default value of the role election option to false in ServerOptions. Refactored TaskManager for improved readability, updated comments, removed unnecessary protected modifiers, and streamlined thread pool initialization and shutdown logic. Added deprecation notice for local master-worker mechanism.

* docs: add DeepWiki badge to README

- Add DeepWiki badge for interactive documentation access
- Badge enables users to easily access AI-powered documentation assistant
- Positioned with other project badges for consistency

---------

Co-authored-by: vaughn <vaughn@apache.org>

Author: imbajin

README.md

@@ -10,6 +10,7 @@
 [![HugeGraph-CI](https://github.com/apache/incubator-hugegraph/actions/workflows/ci.yml/badge.svg)](https://github.com/apache/incubator-hugegraph/actions/workflows/ci.yml)
 [![License checker](https://github.com/apache/incubator-hugegraph/actions/workflows/licence-checker.yml/badge.svg)](https://github.com/apache/incubator-hugegraph/actions/workflows/licence-checker.yml)
 [![GitHub Releases Downloads](https://img.shields.io/github/downloads/apache/hugegraph/total.svg)](https://github.com/apache/hugegraph/releases)
+[![Ask DeepWiki](https://deepwiki.com/badge.svg)](https://deepwiki.com/apache/hugegraph)
 
 </div>