feat: production branch with deploy config for baota panel

- Add deploy/ directory with production env, supervisor, nginx, migration configs
- Include all latest features: admin management, feedback, footer with ICP/beian
- Database: foreign_trade (PostgreSQL), user: foreign_trade
- Frontend: trade.yuzhiran.com, backend proxy via Nginx

deploy/backend/supervisord.conf

@@ -0,0 +1,13 @@
+[program:trademate-backend]
+command=/www/server/panel/pyenv/bin/uvicorn app.main:app --host 0.0.0.0 --port 8000 --workers 2 --proxy-headers --forwarded-allow-ips='*'
+directory=/www/wwwroot/trade.yuzhiran.com/backend
+user=www
+autostart=true
+autorestart=true
+stopasgroup=true
+killasgroup=true
+stdout_logfile=/www/wwwlogs/trademate-backend.log
+stderr_logfile=/www/wwwlogs/trademate-backend.error.log
+stdout_logfile_maxbytes=50MB
+stderr_logfile_maxbytes=50MB
+environment=PATH="/www/server/panel/pyenv/bin:/usr/local/bin:/usr/bin:/bin",HOME="/home/www"