misc: refresh project structure, fully migrate to pnpm, nuxt 4 enhancements, @nuxt/eslint integration, and more!

[lihbr]

Types of changes

• [x] Chore (a non-breaking change which is related to package maintenance)
• [x] Bug fix (a non-breaking change which fixes an issue)
• [x] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Description

Overall maintenance of the kit, and few new features ✨

Checklist:

• [ ] My change requires an update to the official documentation.
• [ ] All TSDoc comments are up-to-date and new ones have been added where necessary.
• [ ] All new and existing tests are passing.

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