fix: prefer nitro.static over _generate

[danielroe]

🔗 Linked issue

❓ 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

Since nuxi v3.8, we've supported setting nuxt.options.nitro.static instead of nuxt.options._generate (which is an internal flag) - see nuxt/nuxt#21860.

Now, in preparation for Nuxt v4, we've removed the types for _generate (see nuxt/nuxt#32355). This PR adds support for new version in backwards compatible way (ignoring type issues) - I'd suggest you remove support in a future major.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 46.34%. Comparing base (1b72db3) to head (642e2e0).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/module.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #774      +/-   ##
==========================================
+ Coverage   46.19%   46.34%   +0.14%     
==========================================
  Files          11       11              
  Lines         671      671              
  Branches       37       37              
==========================================
+ Hits          310      311       +1     
+ Misses        361      360       -1     

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