Improve CLI output with colored and structured logging

[CodeByAlok24]

Problem

Currently all neu CLI output uses plain text
with no visual differentiation between errors,
warnings, and success messages.

Proposed Solution

Add colored output using chalk:

• Red for errors
• Yellow for warnings
• Green for success messages
• White for info

Expected Outcome

Better developer experience with instantly
recognizable output types.

I'd like to implement this if maintainers agree.

[CodeByAlok24]

Implemented in PR #387:
#387

Added chalk colored output with:

• Red background badge for errors
• Green background badge for info/success
• Yellow background badge for warnings