Stabilize runtime config and CI

[k9135515-code]

Summary

• reorganize runtime config into grouped sections with preset/profile support
• add CPU-safe defaults, reusable stage artifacts, and quality checks
• support Groq/OpenRouter through a shared LLM layer and add CI coverage

Verification

• python -m unittest
• python -m unittest test.services.test_config_runtime test.services.test_llm test.services.test_quality test.services.test_task test.services.test_video
• streamlit run webui/Main.py --server.headless=true --server.port=8501