fix(dev): mount src and root as read-only by default

[pi0]

🔗 Linked issue

Resolves #918

❓ 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 like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

We mount src/ and root/ fs mounts during development for convinience and development features however it can be really dangrous to remove project source-code!! Using new unstorage readOnly option on both mounts. If it is proven that write operation is useful, we can switch to noClear to allow per key update.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.