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/.env.production

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+# 生产环境配置（基于宝塔面板 PostgreSQL foreign_trade 数据库）
+APP_NAME=TradeMate
+SECRET_KEY=change-this-to-a-random-secret-key
+JWT_ALGORITHM=HS256
+ACCESS_TOKEN_EXPIRE_MINUTES=60
+REFRESH_TOKEN_EXPIRE_DAYS=30
+
+# 数据库（foreign_trade）
+DATABASE_URL=postgresql+asyncpg://foreign_trade:dWFNi67nHNbPbjmP@localhost:5432/foreign_trade
+
+# Redis（宝塔自带，默认端口）
+REDIS_URL=redis://localhost:6379/0
+
+# Celery
+CELERY_BROKER_URL=redis://localhost:6379/1
+CELERY_RESULT_BACKEND=redis://localhost:6379/2
+
+# AI 提供商（按需填入）
+OPENAI_API_KEY=
+ANTHROPIC_API_KEY=
+DEEPL_API_KEY=
+
+SENSENOVA_API_KEY=
+SENSENOVA_BASE_URL=https://token.sensenova.cn/v1
+SENSENOVA_MODEL=sensenova-6.7-flash-lite
+
+IFLYTEK_API_KEY=
+IFLYTEK_API_BASE=https://maas-api.cn-huabei-1.xf-yun.com/v2
+IFLYTEK_MODEL=astron-code-latest
+
+LOCAL_MODEL_ENABLED=false
+LOCAL_MODEL_URL=http://localhost:8001
+
+# WhatsApp Cloud API
+WHATSAPP_API_TOKEN=
+WHATSAPP_PHONE_NUMBER_ID=
+WHATSAPP_WEBHOOK_VERIFY_TOKEN=
+
+# 微信
+WECHAT_APP_ID=
+WECHAT_APP_SECRET=
+
+# 汇率 API
+EXCHANGE_RATE_API_KEY=
+
+# 文件存储
+UPLOAD_DIR=./uploads
+MAX_UPLOAD_SIZE=10485760
+
+# 错误监控 (Sentry)
+SENTRY_DSN=
+DEBUG=false
+
+# URL（以宝塔实际域名/端口为准）
+FRONTEND_URL=https://trade.yuzhiran.com
+BACKEND_URL=https://api.trade.yuzhiran.com
+
+# 数据库调试关闭
+DB_ECHO=false