docs: rewrite README with use-case focus and competitive positioning

fix: decouple effort from Claude budget_tokens, promote PROXY_DEFAULT_EFFORT to top priority

docs: add Claude Code proxy session example

feat: MCP tool injection, effort passthrough, updated model list

add comments

feat: include Claude Desktop DXT extension

chore: ignore local artifacts

docs: split README into EN/KO

docs: add security notice for production deployment

fix: improve Codex compatibility with tool/message filtering

fix: stabilize tool-calling flow and add diagnostics

fix: support image payloads and role-aware content mapping

docs: add tool-calling compatibility checklist and smoke test

feat: add Anthropic tool-calling bridge with schema normalization

docs: align README with simple gpt workflow and port defaults