fix(nuxi): enable shims in tsdown configuration

[yamachi4416]

🔗 Linked issue

resolves #1150

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

[pkg-pr-new]

• nuxt-cli-playground

  npm i https://pkg.pr.new/create-nuxt@1151
  

  npm i https://pkg.pr.new/nuxi@1151
  

  npm i https://pkg.pr.new/@nuxt/cli@1151
  

commit: f2ed8c6

[github-actions]

📦 Bundle Size Comparison

📈 nuxi

Metric	Base	Head	Diff
Rendered	4456.48 KB	4456.87 KB	+0.39 KB (+0.01%)

➡️ nuxt-cli

Metric	Base	Head	Diff
Rendered	135.93 KB	135.93 KB	0.00 KB (0.00%)

➡️ create-nuxt

Metric	Base	Head	Diff
Rendered	2378.71 KB	2378.71 KB	0.00 KB (0.00%)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@91b2d23). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
packages/nuxi/tsdown.config.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1151   +/-   ##
=======================================
  Coverage        ?   24.08%           
=======================================
  Files           ?       89           
  Lines           ?     4771           
  Branches        ?      253           
=======================================
  Hits            ?     1149           
  Misses          ?     3590           
  Partials        ?       32           

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[codspeed-hq]

CodSpeed Performance Report

Merging #1151 will not alter performance

_{Comparing yamachi4416:fix/nuxiBuildShimsEnable (f2ed8c6) with main (91b2d23)}

Summary

✅ 2 untouched