docs: add license section with legal compliance note

fix: remove hardcoded paths for portability

fix: support Codex CLI tool format and add exec_command

chore: reorganize config and improve cz.sh

fix: handle pretty-printed JSON in request body parser

chore: add node_modules to gitignore

feat: implement server-side agent loop for tool execution

feat: use coding-only endpoint by default for free tier users

feat: change default endpoint to /api/coding/paas/v4

fix: improve error handling and endpoint failover for responses endpoint

feat: change default model to glm-5 and add .env.example

fix: improve streaming response format for Codex CLI compatibility

feat: add robust GLM Codex gateway with endpoint failover