Who is Using OpenMLDB（欢迎社区成员留言反馈）

Please refer to this discussion post:
[Who is Using OpenMLDB（欢迎社区成员留言反馈）](https://github.com/4paradigm/OpenMLDB/discussions/707)

This issue is a request for community feedback on who is using OpenMLDB. The work is to add a comment to the linked GitHub Discussion #707, sharing your use case or experience with the project. No code changes are needed. Simply visit the discussion link, read existing contributions, and post a relevant comment about how you or your organization uses OpenMLDB.

索引モデルが issue の本文から書いたものです。