docs: add English documentation with language switcher

docs: clarify prerequisites and authentication options

docs: add running screenshot to README

fix: rename my-settings.json to settings.json

docs: add third-party API configuration tutorial

docs: comprehensive usage tutorial in README

docs: update README with accurate structure and stats

chore: remove unnecessary internal Anthropic files

fix: add missing files from original repos

docs: update accurate source file counts (1884 TS + 18 JS = 1902 total)

docs: remove star history chart

docs: add star history chart to README

docs: add stargazers wall to README

Initial commit: Open-ClaudeCode with full source and plugins