Add agenttrace to Agent Monitoring

[luoyuctl]

Summary

• Add luoyuctl/agenttrace to the Agent Monitoring section in both English and Chinese READMEs
• Describe its local TUI focus for AI coding agent session cost, token, latency, failure, and report inspection
• Remove trailing whitespace from the final Chinese README heading touched by this edit

Validation

• git diff --check
• No project-level build or test entrypoint found for this Markdown-only list update

[luoyuctl]

Refreshed this PR by resetting the commit author to the GitHub noreply identity. Validation: git diff --check upstream/main...HEAD. Current PR state is CLEAN with no checks configured.