feat(examples): add zeroclaw sandbox example

[hikariming]

Summary

Add a ZeroClaw sandbox example under examples/zeroclaw.

This example uses a thin wrapper image built from the official ghcr.io/zeroclaw-labs/zeroclaw:latest image so it can run with OpenSandbox's Docker bootstrap path.

Changes

• add examples/zeroclaw/main.py
• add examples/zeroclaw/README.md
• add examples/zeroclaw/Dockerfile
• add examples/zeroclaw/build.sh
• update examples index
• update Chinese docs index

Verification

Tested locally with Docker runtime:

examples/zeroclaw/build.sh
opensandbox-server --config ~/.sandbox.toml
uv run --with opensandbox --with requests python examples/zeroclaw/main.py
curl http://<printed-endpoint>/health

Observed HTTP 200 from /health.



# Testing
- [ ] Not run (explain why)
- [ ] Unit tests
- [ ] Integration tests
- [✅ ] e2e / manual verification

# Breaking Changes
- [ ✅] None
- [ ] Yes (describe impact and migration path)

# Checklist
- [✅ ] Linked Issue or clearly described motivation
- [ ✅] Added/updated docs (if needed)
- [ ] Added/updated tests (if needed)
- [ ] Security impact considered
- [ ] Backward compatibility considered

[CLAassistant]

All committers have signed the CLA.