feat: add Docker deployment support

- Add multi-stage Dockerfile for Next.js standalone build
- Add docker-compose.yml with app and MySQL 8.0 services
- Add .dockerignore for optimized builds
- Update next.config.ts with standalone output

docker-compose.yml

@@ -0,0 +1,52 @@
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: recipe_tool_app
+    restart: unless-stopped
+    ports:
+      - "3000:3000"
+    environment:
+      - NODE_ENV=production
+      - DB_HOST=db
+      - DB_PORT=3306
+      - DB_USER=${DB_USER:-root}
+      - DB_PASSWORD=${DB_PASSWORD:-123456}
+      - DB_NAME=${DB_NAME:-recipe_tools}
+      - AI_API_KEY=${AI_API_KEY}
+      - AI_BASE_URL=${AI_BASE_URL:-https://api.openai.com/v1}
+      - AI_MODEL=${AI_MODEL:-gpt-3.5-turbo}
+    depends_on:
+      db:
+        condition: service_healthy
+    networks:
+      - recipe_network
+
+  db:
+    image: mysql:8.0
+    container_name: recipe_tool_db
+    restart: unless-stopped
+    environment:
+      - MYSQL_ROOT_PASSWORD=${DB_PASSWORD:-123456}
+      - MYSQL_DATABASE=${DB_NAME:-recipe_tools}
+    ports:
+      - "3306:3306"
+    volumes:
+      - mysql_data:/var/lib/mysql
+      # 初始化脚本（可选）
+      # - ./docker/mysql/init.sql:/docker-entrypoint-initdb.d/init.sql
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    networks:
+      - recipe_network
+
+networks:
+  recipe_network:
+    driver: bridge
+
+volumes:
+  mysql_data: