docs: agent section only example prompt block (remove duplicate URL line)

docs: use fenced text blocks for agent example prompts (fix GitHub link styling)

docs(zh): fix punctuation in example prompt (comma vs enumeration mark)

docs: embed repo URL in example agent prompt

docs: prominent OpenClaw/AI agent section with repo URL

docs: move multilingual README files into doc/; slim root README

docs: default README to English; move Simplified Chinese to README.zh-CN.md

docs: add Japanese and Traditional Chinese README, unify 5-language nav

docs: multilingual README (zh/en/ko) and expanded systemd section

Add GitHub Actions CI and unittest smoke tests

Initial release: CLI client for Fast Note Sync Service