Add top-tier open, ungated models (DeepSeek R1 Distill, Qwen Coder, Phi-3.5) to configurations

Add Google Gemma 2 (2B, 9B, and 27B) models to available configurations

Set Qwen 2.5 72B Instruct as default for HF Serverless API mode to avoid gated repo issues

Fix UI compilation issues, rename app to Saffan Chat, add AI Persona & Skill presets

Escape LaTeX curly braces in SYSTEM_PROMPT to fix string formatting KeyError

Deploy premium Claude-style LLM chatbot with web search, scraping, memory, and access control