feat: Add multi-provider LLM support with Ollama, Anthropic, Google, Groq, and more
- Added LLMFactory for provider-agnostic LLM creation
- Supports OpenAI, Ollama (local/free), Anthropic, Google, Groq, Azure, Together, HuggingFace, OpenRouter
- Updated memory system to be provider-agnostic
- Fixed Ollama integration with tool calling support (llama3.2, llama3.1, mistral-nemo, qwen2.5)
- Added comprehensive documentation and examples
- Updated CLI with new Ollama model selections
- 100% backward compatible - OpenAI remains default
- Verified working with tests
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