Add awesome-opensource-ai 🤖🤖🤖

[alvinreal]

This PR adds a curated list of open-source AI projects, models, tools, and infrastructure.

List: awesome-opensource-ai

The list includes battle-tested, production-proven open-source AI resources across categories like:

• Core frameworks (PyTorch, TensorFlow, JAX)
• Open foundation models (Llama, Mistral, Qwen, DeepSeek)
• Inference engines (vLLM, llama.cpp, TGI)
• Agentic AI & multi-agent systems
• RAG & knowledge systems
• Generative media tools
• MLOps/LLMOps infrastructure

The list follows awesome list conventions and is actively maintained.