Fix miner install docs to use installer script

[Thanhdn1984]

Fixes #5656.\n\nUpdates public install snippets that pointed users to pip install clawrtc for mining, which is not currently the working PyPI install path per the issue. Uses the documented installer script instead.\n\nVerification:\n- git diff --check passed.

[github-actions]

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[hubeiqiao]

Thanks for fixing the stale PyPI install reference. The README and zh-CN README replacements look directionally correct to me, and the doc diff is whitespace-clean.

One blocker remains in docs/FAQ.md: the PR replaces the Windows section's pip install clawrtc line with a Unix shell command while leaving it inside a powershell fenced block and under the # 使用 Python 安装 comment:

# 使用 Python 安装
curl -fsSL https://rustchain.org/install.sh | bash

That command requires bash and is not a native PowerShell/Python install path, so Windows readers still get misleading installation instructions. Please either move the installer command into a bash/WSL/Linux/macOS snippet, or rewrite the Windows subsection to say WSL/Linux/macOS should use the installer script while native Windows mining/install support is not available or should use the documented alternative.

Validation I ran:

• git diff --check origin/main...pr-6060 -- README.md docs/FAQ.md docs/zh-CN/README.md -> passed

[jaxint]

LGTM! Great work on this PR. 🚀