Update project configuration and structure with Docker support and environment variable adjustments

- Updated .env.example to reflect new LLM configuration with Aliyun's API.
- Enhanced .gitignore to include additional files and directories for better exclusion of sensitive and build artifacts.
- Added docker-compose.yml for streamlined deployment of backend and frontend services.
- Introduced Dockerfiles for both backend and frontend to facilitate containerized builds.
- Created README.md to provide comprehensive project documentation and setup instructions.
- Established nginx configuration for frontend to support API proxying and static file serving.

.env.example

@@ -3,8 +3,8 @@ ZEP_API_KEY=your_zep_api_key_here
 
 # ===== 通用 LLM 配置 =====
 LLM_API_KEY=your_api_key_here
-LLM_BASE_URL=https://api.openai.com/v1
-LLM_MODEL_NAME=gpt-4o-mini
+LLM_BASE_URL=https://dashscope.aliyuncs.com/compatible-mode/v1
+LLM_MODEL_NAME=qwen-plus
 
 # ===== 加速 LLM 配置（可选）=====
 LLM_BOOST_API_KEY=your_boost_api_key_here