feat: add harbor benchmark adapter

[minixalpha]

Summary

• Add an isolated Harbor 0.21.0 workspace under benchmarks/harbor with the public adapter path harbor_adapter:NanoPyCodeAgent, keeping Harbor out of the end-user package and root dependency graph.
• Support reproducible installation from a published version or exact Git revision, pin the uv bootstrap, probe the installed agent version, deliver task instructions through stdin, preserve benchmark-safe logging, and normalize Harbor model credentials for the Anthropic SDK.
• Add five adapter contract tests, bilingual Harbor usage guides, an Unreleased changelog entry, and synchronized Chinese and English 0.8.x development notes.

Validation

• uv run --frozen pytest — 129 passed.
• uv run --project benchmarks/harbor pytest -c benchmarks/harbor/pyproject.toml benchmarks/harbor/tests — 5 passed.
• uv run --project benchmarks/harbor harbor --version — 0.21.0.
• A real Docker run completed the full adapter path with zero infrastructure exceptions. The task verifier passed 5 of 6 checks and returned reward 0 because the generated check_cert.py relied on cryptography, which was absent from the verifier Python environment; this was a task-solution portability failure rather than an adapter failure.
• Root wheel inspection confirmed that neither the adapter nor Harbor is included in the end-user distribution.