Refactor project structure by removing Docker support and updating environment configuration

- Deleted docker-compose.yml, backend Dockerfile, frontend Dockerfile, and nginx configuration to streamline project setup.
- Updated .env.example to reorganize LLM and ZEP API configurations for clarity and ease of use.
- Enhanced README.md to reflect changes in project structure and provide clearer setup instructions.

docker-compose.yml

@@ -1,44 +0,0 @@
-version: '3.8'
-
-services:
-  # 后端服务
-  backend:
-    build:
-      context: ./backend
-      dockerfile: Dockerfile
-    container_name: mirofish-backend
-    ports:
-      - "5001:5001"
-    environment:
-      - FLASK_HOST=0.0.0.0
-      - FLASK_PORT=5001
-      - FLASK_DEBUG=false
-    env_file:
-      - .env
-    volumes:
-      # 持久化上传文件和模拟数据
-      - ./data/uploads:/app/uploads
-    restart: unless-stopped
-    healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost:5001/health"]
-      interval: 30s
-      timeout: 10s
-      retries: 3
-
-  # 前端服务
-  frontend:
-    build:
-      context: ./frontend
-      dockerfile: Dockerfile
-      args:
-        - VITE_API_BASE_URL=http://backend:5001
-    container_name: mirofish-frontend
-    ports:
-      - "3000:80"
-    depends_on:
-      - backend
-    restart: unless-stopped
-
-networks:
-  default:
-    name: mirofish-network