fix: Copy nginx.conf to correct path /etc/nginx/nginx.conf

fix: Upgrade Node.js 18 to 20 and use npm install instead of npm ci for lock file sync

feat: Update with all 12 gap fixes - SQLModel, Better Auth, OpenAI Agents, Urdu, Voice

fix: Update startup script and supervisord config for HF Spaces

feat: Deploy Todo App Phase 5 to Hugging Face Space