* docs: reorganize docs into en/cn/ja folders
- Move documentation files into language-specific folders (en, cn, ja)
- Add Chinese and Japanese translations for all docs
- Extract Docker section from README to separate doc file
- Update README to link to new doc locations
* docs: fix links to new docs folder structure
* docs: update README and provider docs
* docs: fix broken import statements in cloudflare deploy guides
* docs: sync CN/JA READMEs with EN structure and fix all paths
