feat(nuxi): Add .data Directory Cleanup to nuxi cleanup Command

[nexoscreator]

The npx nuxi cleanup command removes commonly generated files and caches, such as:

• .nuxt (build files)
• .output (server output files)
• node_modules/.vite (Vite cache)
• node_modules/.cache (other build caches)

However, it does not remove the .data directory, which stores Nitro-generated data files and Nuxt Content v3 data (e.g., contents.sqlite), it should be safe to remove during cleanup.

• Update nuxi cleanup to remove the .data directory by default.
• Add an optional flag (--keep-data) for those who want to retain it.

This would help keep projects clean, free of outdated files, and more....