feat: change pnpm install packageName to pnpm add packageName on PackageManagerTabs

[Marukome0743]

Summary

Align PackageManagerTabs with pnpm's CLI conventions by normalizing pnpm commands and using 'add' for package installation.

Enhancements:

• Include pnpm in normalizeCommand logic alongside yarn and bun
• Normalize pnpm commands in PackageManagerTabs
• Switch pnpm dependency install commands from 'install' to 'add'

Tests:

• Update E2E fixture to expect 'pnpm add rspress -D' instead of 'pnpm install rspress -D'

Appearance

Before	After

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[SoonIter]

thanks❤️~

[SoonIter]

I like the table you described; it is clear, easy to check, and of course, it has a distinct personality.