feat: convert config class to functional

[zhravan]

Issue

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Description

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Scope of Change

Select all applicable areas impacted by this PR:

• View (UI/UX)
• API
• CLI
• Infra / Deployment
• Docs
• Other (specify): ________

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Related PRs (if any)

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Developer Checklist

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• Add valid/relevant title for the PR
• Self-review done
• Manual dev testing done
• No secrets exposed
• No merge conflicts
• Docs added/updated (if applicable)
• Removed debug prints / secrets / sensitive data
• Unit / Integration tests passing
• Follows all standards defined in Nixopus Docs

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Reviewer Checklist

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• Peer review done
• No console.logs / fmt.prints left
• No secrets exposed
• If any DB migrations, migration changes are verified
• Verified release changes are production-ready

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch refactor/cli/config

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