Update assistant persona to Mintoak Website Assistant, add evaluation scripts and update data

Update leadership information, separate CTO query rules, and rebuild DB

Update KB addresses, dynamic aggregation, and increase chunk size

Enhance retrieval filters, add career/address rules, increase max chunk size, and rebuild data

feat: integrate fine-tuned Qwen 2.5 1.5B persona and evaluator parity

Deploy RAG chatbot with auto-population