docs: move Bun tabs to first position in installation

[ded-furby]

Overview

Move Bun to the first tab position across docs/guide/installation.md where package-manager examples are shown, matching issue #2423 request.

Manual Testing

• Verified the affected code groups now list Bun first by reviewing the file diff.
• No functional code paths changed.

Related Issue

This PR closes #2423

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@wxt-dev/module-vue

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@wxt-dev/unocss

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commit: 78cdf40

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.54%. Comparing base (1a3f4f6) to head (78cdf40).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2428   +/-   ##
=======================================
  Coverage   78.54%   78.54%           
=======================================
  Files         133      133           
  Lines        3882     3882           
  Branches      875      875           
=======================================
  Hits         3049     3049           
+ Misses        747      746    -1     
- Partials       86       87    +1     

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[github-actions]

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