chore(docs): acknowledge AtomGit hosting (#1817)

## Summary
- add AtomGit to the README acknowledgements across all translated
README files
- keep the mention in acknowledgements instead of the top project
intro/download area

## Checks
- `git diff --check -- README.md docs/README.zh-CN.md
docs/README.ja-JP.md docs/README.ru-RU.md docs/README.vi.md
docs/README.fr.md docs/README.ko-KR.md`

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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

README.md

@@ -496,6 +496,7 @@ flowchart TD
 
 ## Acknowledgements
 
+- [AtomGit](https://gitcode.com/moeru-ai/airi): for hosting AIRI in mainland China and helping local users access the project and Release downloads faster.
 - [Reka UI](https://github.com/unovue/reka-ui): for designing the documentation site, the new landing page is based on this, as well as implementing a massive amount of UI components. (shadcn-vue is using Reka UI as the headless, do checkout!)
 - [pixiv/ChatVRM](https://github.com/pixiv/ChatVRM)
 - [josephrocca/ChatVRM-js: A JS conversion/adaptation of parts of the ChatVRM (TypeScript) code for standalone use in OpenCharacters and elsewhere](https://github.com/josephrocca/ChatVRM-js)