feat(nuxt): support Nuxt 4 and pre-bundle pinia-orm in dev

[CodeDredd]

Nuxt 4 support

• @nuxt/kit ^4.5, @nuxt/module-builder ^1, nuxt 4.5 as dev dependency, explicit compatibility: { nuxt: '>=3.14.0' } — the module keeps working on current Nuxt 3 while being first-class on Nuxt 4
• dev dependencies moved to pinia 4 + @pinia/nuxt 1 (peer range >=0.10.0 unchanged, so Nuxt-3/pinia-3 setups keep resolving)
• transitive @unhead/vue deduped to a Nuxt-4-compatible version in the lockfile

New feature: automatic dependency optimization

The module now pushes pinia-orm (+ its normalizr chunk) into vite.optimizeDeps.include. This kills the classic dev-server annoyance where vite discovers pinia-orm late and restarts with "new dependencies optimized — reloading". Opt-out: piniaOrm: { optimizeDeps: false }. Documented on the Nuxt setup page.

Playgrounds

• packages/nuxt/playground and playgrounds/nuxt3 both build green on Nuxt 4.5 (verified locally with nuxi build)
• playgrounds/nuxt3 bumped to nuxt ^4.5, @pinia/nuxt ^1, pinia ^4, uuid ^11, nanoid ^5

Other ideas considered (not included, possible follow-ups)

• addImportsDir convention for a ~/models directory (auto-import model classes)
• auto-registering useAxiosRepo when @pinia-orm/axios is installed
• shipping a useRepo payload plugin for SSR state transfer tuning

Note: merging this after #2046 (Node 22) produces a trivial package.json conflict (engines field) that gets resolved on merge.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.24%. Comparing base (a389d1c) to head (6268183).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2047   +/-   ##
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  Coverage   99.24%   99.24%           
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  Files          83       83           
  Lines        3185     3185           
  Branches      562      562           
=======================================
  Hits         3161     3161           
  Misses         17       17           
  Partials        7        7           

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