refactor(python): replace print statements with logging

[aviralgarg05]

Summary

Replace print statements in Python AI modules with structured logging.

Why

Mixed stdout prints make CLI output noisy and harder to control compared to logger-based output.

Tasks

• Replace user-facing prints in nexum_ai/translator.py and nexum_ai/model_manager.py with logging
• Keep warning/error semantics equivalent
• Update tests/mocks as needed

Acceptance Criteria

• Modules use logger calls instead of direct print statements
• Behavior remains backward-compatible for success/failure paths
• Python tests remain green

[coderabbitai]

🔗 Related PRs

#39 - Add comprehensive pytest test suite for nexum_ai module [merged]
#122 - refactor: replace print statements with logging [merged]

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[Subhayoni]

Hi, I would like to work on this issue. Is it available?