Add steps to the guide document

Author: xuyaqist

doc/docs/en/getting-started/development-guide.md

@@ -109,18 +109,24 @@ pnpm dev
 ```
 
 ### Service Startup
-Before starting services, you need to activate the virtual environment:
+Before starting services, you need to create and activate the virtual environment:
 
 ```bash
 # Execute in the backend directory of the project root directory
 cd backend
+python -m venv .venv
 source .venv/bin/activate  # Activate virtual environment
 ```
 
 ::: warning Important Notes
 On Windows, you need to execute the `source .venv/Scripts/activate` command to activate the virtual environment.
 :::
 
+generate .env in the root directory
+```bash
+bash docker/generate_env.sh
+```
+
 Nexent includes three core backend services that need to be started separately:
 
 ```bash

doc/docs/zh/getting-started/development-guide.md

@@ -109,18 +109,24 @@ pnpm run dev
 ```
 
 ### 服务启动
-在启动服务之前，需要先激活虚拟环境：
+在启动服务之前，需要先创建并激活虚拟环境：
 
 ```bash
 # 在项目根目录的backend目录下执行
 cd backend
+python -m venv .venv
 source .venv/bin/activate  # 激活虚拟环境
 ```
 
 ::: warning 重要提示
 Windows操作系统需执行`source .venv/Scripts/activate`命令激活虚拟环境。
 :::
 
+在根目录中生成.env
+```bash
+bash docker/generate_env.sh
+```
+
 Nexent 包含三个核心后端服务，需要分别启动：
 
 ```bash