fix: replace direct psycopg DB connection with Supabase REST API

Fix: prefer IPv4 via gai.conf, revert database.py to simple connection

Fix: use hostaddr param to force IPv4 for psycopg connection

Fix: resolve DB hostname to IPv4 before connecting

Fix: force IPv4 DNS resolution for PostgreSQL connections

Fix: strip whitespace/newlines from env vars

Fix Dockerfile: add user 1000 as required by HF Spaces

Add env_check to health endpoint for debugging

Fix: read env vars at runtime not import time for HF Space secrets

Fix: load_dotenv override=False to respect HF Space secrets

Fix: use Docker build secret mount for HF_TOKEN

hmm maybe1

Fix: handle empty HF_TOKEN for public model repo

hmm maybe

Initial commit — RetailTalk backend for HuggingFace Spaces