Simplify CosmicCat AI Assistant - Remove HF expert features and branding changes

Fix chat interface response issues: proper session handling, error handling, and UI display fixes

Implement Core LLM Factory Module with provider abstraction and factory pattern

Update app.py imports and send button logic, enhance config detection for HF Spaces, improve HF token validation

Fix Hugging Face provider by removing problematic proxies parameter

Update OllamaProvider to use chat endpoint for consistency and fix README config

Fix critical LLM provider bugs, Redis config, and Streamlit null safety issues

Refactor LLM module to support multiple providers with unified interface

Implement LLM abstraction layer

Initialize project structure for AI Life Coach