docs: add contributors section to README

[jeff-r2026]

What

Add a Contributors section at the end of both READMEs (README.md / README.zh-CN.md), right after Contributing.

Uses the contrib.rocks dynamic avatar image, so no contributor list needs to be maintained by hand — new contributors show up automatically.

<a href="https://github.com/Tencent/teamai-cli/graphs/contributors">
  <img src="https://contrib.rocks/image?repo=Tencent/teamai-cli" alt="Contributors" />
</a>

Why

Give visible credit to everyone who has contributed, and make the contributors graph one click away from the README.

Test Plan

Docs-only change; no CLI behavior is affected, so no build or end-to-end run applies.

• Verified the image endpoint actually resolves: curl -sS -o /dev/null -w "%{http_code} %{content_type}" "https://contrib.rocks/image?repo=Tencent/teamai-cli" → 200 image/svg+xml
• Inspected the returned SVG: 812x200, contains 28 embedded contributor avatars
• Both language READMEs updated in sync, with localized wording in the Chinese version
• Single commit, only README.md and README.zh-CN.md touched

Note

contrib.rocks is cached by its own CDN and by GitHub's camo proxy, so newly merged contributors can take hours to appear. If instant accuracy matters more than zero maintenance, a scheduled action such as contributors-readme-action that writes a real table into the README would be the alternative.

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