feat(channels): add Xianyu(闲鱼) support

[wby1121]

Summary

This PR adds Xianyu support through a new XianyuChannel.

The integration is built on top of mcporter with the Node-based mcp-goofish backend. It adds:

• Xianyu / Goofish URL detection
• health checks for Node.js, mcporter, and MCP availability
• optional setup guidance in the CLI and install docs
• test coverage for channel registration and health-check behavior

Auth / setup

This integration is not zero-config.

It requires:

• Node.js 18+
• mcporter
• mcp-goofish
• authenticated Xianyu cookies / session configured for the MCP backend

Dependencies

No new Python dependency is introduced in this PR.

The only external dependency is the Node-based mcp-goofish tool used through mcporter.

Notes

I also removed files that should not have been included in the PR and rebased the branch onto the latest main.

[Panniantong]

Hi @wby1121, thanks for adding Xianyu support! The channel implementation looks interesting. 👍

Before we can merge, a few things need to be addressed:

1. Remove files that shouldn't be in the PR

• AGENTS.md — This is a local workspace file, not part of the project. Please remove it.
• config/mcporter.json — This contains local MCP configuration. Should not be committed.

2. Add a PR description

Please add a brief description explaining:

• What the Xianyu channel does (which APIs it uses)
• Whether it requires login/cookies or is zero-config
• Any dependencies needed

3. Rebase onto latest main

The main branch has had several merges since this PR was opened. Please rebase:

git fetch upstream
git rebase upstream/main
git push --force-with-lease

Once these are addressed, we're happy to merge! 🚀

[wby1121]

Hi @Panniantong, Thanks for the review — updated now.

I removed the extra files from the PR, rebased onto the latest main, force-pushed the branch, and added a PR description covering the Xianyu backend, auth requirements, and dependencies.

I also cleaned up the setup wording so it clearly reflects that this integration uses mcporter + mcp-goofish and requires authenticated cookies/session.

Verified with:

• python3 -m pytest tests/test_channels.py -v
• python3 -m pytest tests/test_cli.py -v
• python3 -m pytest tests/test_channel_contracts.py -v

[Panniantong]

感谢贡献闲鱼 channel！核心的 xianyu.py 实现质量不错（check() 分层验证、测试覆盖完整），但这个 PR 的改动范围远超预期，有几处必须修改：

必须回滚的改动：

1. 不能删除 XueqiuChannel（雪球）注册和测试：雪球是现有的完整功能 channel，删除会造成功能倒退。请恢复 channels/init.py 中的 XueqiuChannel，以及 tests/ 中的雪球测试。

2. bird -> xreach 的 Twitter 工具迁移不属于本 PR 范围：这是独立的系统性变更，请拆出去单独开 PR。当前项目已迁移到 bird CLI，请勿在此 PR 中改回 xreach。

3. CLI 功能删除（skill --install/--uninstall、format xhs、OPENCLAW_HOME 等）未在 PR 描述中说明，且这些是破坏性变更。请恢复或单独开 PR 讨论。

可以保留的改动：

• xianyu.py 新文件 ✅
• 在 init.py 中添加 XianyuChannel（但不删 XueqiuChannel）✅
• 闲鱼相关的文档和配置引导 ✅
• TestXianyuChannel 测试 ✅

建议做法：

1. 在此 PR 中只保留添加闲鱼 channel 的最小改动
2. 将 Twitter 工具迁移（如果确实需要）单独开 PR
3. 把 XueqiuChannel 恢复后重新请求 review

很期待闲鱼功能合并！

[wby1121]

已按 review 建议收敛这条 PR，感谢指出范围问题。

这次我已经把无关改动撤回，只保留“新增闲鱼 channel”的最小改动，主要调整如下：

1. 已恢复 XueqiuChannel

• 恢复了 agent_reach/channels/__init__.py 中的 XueqiuChannel
• 恢复了相关雪球测试，不再删除现有完整 channel 功能

2. 已撤出本 PR 范围外的 Twitter / CLI 变更

• 不再改动当前主线的 bird 方案
• 恢复了被误删的 CLI 功能，包括：
  • skill --install / --uninstall
  • format xhs
  • OPENCLAW_HOME 支持
  • doctor 的原有行为

3. 保留的改动仅限闲鱼相关

• 新增 agent_reach/channels/xianyu.py
• 在 __init__.py 中追加 XianyuChannel，不再替换现有 channel
• 保留闲鱼相关文档与配置引导
• 保留 TestXianyuChannel 及相关回归测试

另外我已经重新跑过测试：

python3 -m pytest tests/ -q

结果：
90 passed

现在这条 PR 应该只包含闲鱼 support 的最小必要改动。
麻烦你有空再帮我看一轮，感谢。