fix(pack): restore conda packaging tools before conda-pack (#3988)

[jinglinpeng]

Description

This PR fixes Windows desktop packaging failures where conda-pack reports conda-managed setuptools files as deleted or overwritten after installing qwenpaw[full] into the temporary packaging environment.

The root cause is that pip dependency resolution can uninstall/reinstall packages that were originally managed by conda. The packaging script now avoids explicitly upgrading pip with pip, then restores conda-managed pip, setuptools, and wheel before running conda-pack. The existing unpinned conda-pack install behavior is preserved.

Related Issue: Fixes #3988

Security Considerations: No security-sensitive runtime behavior changes. This only affects the temporary conda environment used by desktop packaging scripts.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• Refactoring

Component(s) Affected

• Core / Backend (app, agents, config, providers, utils, local_models)
• Console (frontend web UI)
• Channels (DingTalk, Feishu, QQ, Discord, iMessage, etc.)
• Skills
• CLI
• Documentation (website)
• Tests
• CI/CD
• Scripts / Deploy

Checklist

• I ran pre-commit run --all-files locally and it passes
• If pre-commit auto-fixed files, I committed those changes and reran checks
• I ran tests locally (pytest or as relevant) and they pass
• Documentation updated (if needed)
• Ready for review

For Channel Changes (DingTalk, Feishu, QQ, Console, etc.)

• I ran ./scripts/check-channels.sh (or ./scripts/check-channels.sh --changed) and it passes
• Contract test exists in tests/contract/channels/test_<channel>_contract.py (REQUIRED)
• Contract test implements create_instance() with proper channel initialization
• All 19 contract verification points pass (see tests/contract/channels/__init__.py)
• Optional: Unit tests in tests/unit/channels/test_<channel>.py for complex internal logic

Testing

• Ran Python syntax validation for the changed packaging script.
• Ran full A/B Windows packaging reproductions from clean temporary repository copies:
  • Original script reproduced the reported CondaPackError for overwritten setuptools files during conda-pack.
  • Patched script passed the conda-pack phase and produced dist\qwenpaw-env.zip.
• The patched full run then stopped later in the Codex sandbox because PowerShell ConstrainedLanguage blocks [System.IO.Path]::IsPathRooted(...); this happens after the fixed conda-pack step and is unrelated to this issue.

Local Verification Evidence

python -m py_compile scripts\pack\build_common.py
# passed

scripts/pack/build_win.ps1  # A/B full packaging runs from clean temporary copies
# original: CondaPackError: Files managed by conda were found to have been deleted/overwritten - setuptools 82.0.1
# patched: Packed to ...\dist\qwenpaw-env.zip

Additional Notes

The fix intentionally does not pin or change the conda-pack version. The packaging script keeps installing conda-pack using the existing unversioned conda spec.

[github-actions]

Welcome to QwenPaw! 🐾

Hi @jinglinpeng, this is your 12th Pull Request.

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• ✅ Type of Change - Bug fix / Feature / Breaking change / Documentation / Refactoring
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• ✅ Checklist:
  • Run and pass pre-commit run --all-files
  • Run and pass relevant tests (pytest or as applicable)
  • Update documentation if needed
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  # paste summary result
  
  pytest
  # paste summary result

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[wfeng007]

有些建议。可能不只是 pip, setuptools 。如果是conda-pack 0.8.1，还有个库：packaging
所以需要指定conda-pack版本。我本地处理方案是，执行后重新装备一遍会检测的包：

        # Restore conda-managed pip, setuptools, and packaging to fix conda-pack conflicts
        # This overwrites any pip-modified files back to conda versions
        # Prevents "Files managed by conda were found to have been deleted/overwritten" error
        print("Restoring conda-managed pip, setuptools, and packaging...")
        _run(
            [
                conda,
                "run",
                "-n",
                env_name,
                "conda",
                "install",
                "pip",
                "setuptools",
                "packaging",
                "--force-reinstall",
                "-y",
                "--quiet",
            ],
        )

另外，def _run( cmd: list[str], cwd: Path | None = None, env: dict[str, str] | None = None, ) -> None:
这个方法如果ci环境兼容，最好重写成子进程std/sterr反馈到主进程打印标准输出。否则及其难排障。
我本地跑通的改动：
build_common.py