[codex] Add one-command quickstart

[BruceL017]

What changed

• add a zero-install uvx quickstart to both Chinese READMEs
• explain the old-pip setup.py or setup.cfg not found editable-install error
• add a CI job that exercises the documented one-command entry point

Why

The manual installation path is correct, but it is easy for users or agents to omit the Python version check or pip upgrade when copying a shortened command sequence. On macOS, Python 3.9 with pip 21.2.4 then fails before the cleanapp console script is created, and every later command reports that .venv/bin/cleanapp does not exist.

The new quickstart lets users with uv run CleanApp directly from GitHub in an isolated environment:

uvx --from git+https://github.com/clawdbot502/clean-cli cleanapp doctor

The existing manual installation flow remains available as the fallback.

Validation

• uvx --refresh --from . cleanapp --version → cleanapp 0.1.0
• uv run --extra dev pytest → 24 passed
• workflow YAML parsed successfully
• git diff --check passed

[clawdbot502]

Reviewed the latest revision. The documentation-only change looks reasonable, and I verified both quickstart paths locally:

• uvx --refresh --from . cleanapp --version → cleanapp 0.1.0
• uvx --refresh --from git+https://github.com/clawdbot502/clean-cli cleanapp doctor → macOS/Python checks pass and all 11 rules load

I am not merging yet because two merge gates are still unresolved:

1. This PR is still marked Draft. Please mark it ready for review when the change is final.
2. CI has not run successfully: the current workflow result is action_required (run 29244086993), so the maintainer must approve the external-contributor workflow and let all checks complete successfully.

Once the PR is ready and CI is green, it should be eligible for merge.

[clawdbot502]

Approved after reviewing the documentation and CI changes. All five macOS checks pass, including Python 3.11-3.14 packaging tests and the one-command uvx quickstart.