docs(readme): add install warnings for snap and winget

[pangbo13]

Checklist

• Changes have been tested locally and work as expected.
• All tests in workflows pass successfully.
• Documentation has been updated if necessary.
• Code formatting and commit messages align with the project's conventions.
• Comments have been added for any complex logic or functionality if possible.

This PR is a ..

• 🆕 New feature
• 🐞 Bug fix
• 🛠 Refactoring
• ⚡️ Performance improvement
• 🌐 Internationalization
• 📄 Documentation improvement
• 🎨 Code style optimization
• ❓ Other (Please specify below)

Related Issues

Description

增加snap和winget的warning，与官网同步

Additional Context

Summary by Sourcery

Document additional installation warnings for Snap and Winget package sources across all localized READMEs.

Documentation:

• Add a warning about Snap installs storing game data in sandboxed directories and the need to back up saves and other data before uninstalling.
• Add a warning about verifying the Winget installer source and URL before installation in English, Simplified Chinese, and Traditional Chinese READMEs.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Documents new safety warnings for Snap and Winget installation methods across the main and localized READMEs, highlighting sandboxed data for Snap and source verification for Winget.

File-Level Changes

Change	Details	Files
Add Snap and Winget installation safety warnings to English and Chinese READMEs.	Insert a warning block after the Snap install snippet explaining sandboxed game data and advising users to back up saves and mods before uninstalling. Insert a warning block after the Winget install snippet advising users to inspect the installer URL via winget show SJMC.SJMCL and verify it comes from trusted project domains. Mirror the same Snap and Winget warning content in Simplified Chinese and Traditional Chinese documentation, using localized phrasing while preserving meaning.	README.md docs/README.zh-Hans.md docs/README.zh-Hant.md

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