Localized Cloud promotion tips for English and Japanese versions.
EN tips emphasize Slack, LINE, WeCom (internationally relevant).
JA tips emphasize LINE and Lark (Japan-relevant platforms).
* 重构文档结构：移除 docs 目录，调整文件组织结构
* Reorder "插件 SDK API" section in docs.json
* Refactor and clarify various documentation sections
* Refine warnings and info boxes across multiple docs
* Refactor and simplify Japanese documentation content
* Update package.json to include mintlify as a dependency and add pnpm-lock.yaml for dependency management
* Update blog link and add description in docs.json
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Co-authored-by: Junyan Chin <[email protected]>
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