refactor: Extract duplicate resolve_openai_configs to shared utility module

[glebbg]

PR Type

• RL Environment PR - Complete Environment Snapshot & Zero-Training sections
• Non-Environment PR - Complete Description, Related Issues & Type of Change sections

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📝 General Information

Description

This PR eliminates code duplication by extracting the resolve_openai_configs function that was identically implemented in three server modules (vllm_server.py, sglang_server.py, openai_server.py) into a dedicated utility module config_utils.py.

Related Issues

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Code refactor (no functional changes)
• Build/CI/CD related changes
• Other (please describe):

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🔖 Environment Snapshot

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🧪 Zero-Training Test Results

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✅ Developer & Reviewer Checklist

• Code follows project style (black, isort, flake8 pass with pre-commit)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes
• Docstrings added for all new public classes / functions
• If .env vars required, did you add it to the .env.example in repo root?

[glebbg]

Hello @dmahan93, can you check please?