Beautiful onboarding CLI and full more pretty print during execution

[Fosowl]

This PR improves user experience by introducing an onboarding CLI for easier setup, cleaning up noisy console output, and fixing SmolAgent color rendering during execution.
Onboarding CLI – Interactive setup flow for first-time users to configure environment and credentials
Pretty print execution – Formatted, readable output during agent runs instead of raw dumps
Quiet by default – Disabled debug verbosity; users opt-in via --verbose
Removed noise – Eliminated redundant/oversharing print statements
Fixed execution colors – SmolAgent color codes now render properly in terminal output

Contribution checklist

Please confirm the following before requesting review:

• [x ] I have read CONTRIBUTING.md, docs/licensing-notes.md, and the repository license information (LICENSE, NOTICE) for this repository (Apache License 2.0).
• [ x] I have read docs/cla-process.md and understand the CLA workflow for contributions.
• [x ] I confirm that I have the legal right to submit this contribution.
• [x ] I have signed the required short Individual Contributor Agreement, or I will complete it if requested.
• [ x] If this contribution is made in the course of employment or under institutional IP rules, I understand that maintainers may also request the optional employer authorization.
• [ x] I am not knowingly submitting code that is incompatible with this repository’s Apache 2.0 licensing terms and CLA requirements.

[lfnothias]

Beautiful !

[taojiang9914]

Excellent.