debug: add chatbot raw completion logging

fix: increase Prisma interactive transaction timeout to 30000ms

feat: implement chatbot service, active shift logic corrections, audit logs, and void transaction tool

fix: change Docker base image to node:18-slim and install openssl to resolve Prisma library compatibility

chore: add Hugging Face Spaces YAML metadata

feat: initial commit of Tokiva POS Node backend for Hugging Face