Wire upsell strategy into LLM prompts for humanistic persuasion.

Overhaul: Python-first intent (3-tier), hybrid rewriter, improved system prompt, chunk dedup, LRU cache, natural upsell (button-only CTA)

Unify token tracking, smart links, and personality settings across admin and chat.

Enforce brief sales-focused chatbot rules with spoiler guard and buy CTAs.

Restructure project for HF Spaces deployment