Update workflow for direct invocation de Koishi

zh-CN/manual/starter/direct.md

@@ -36,6 +36,7 @@ npm init
 
 # 安装 Koishi 和相关插件
 npm i koishi \
+      @koishijs/plugin-server \
       @koishijs/plugin-console \
       @koishijs/plugin-sandbox \
       @koishijs/plugin-echo
@@ -49,6 +50,7 @@ yarn init
 
 # 安装 Koishi 和相关插件
 yarn add koishi
+         @koishijs/plugin-server \
          @koishijs/plugin-console \
          @koishijs/plugin-sandbox \
          @koishijs/plugin-echo
@@ -62,16 +64,18 @@ yarn add typescript @types/node esbuild esbuild-register -D
 
 ```ts title=index.ts no-extra-header
 import { Context } from 'koishi'
+import server from '@koishijs/plugin-server'
 import console from '@koishijs/plugin-console'
 import * as sandbox from '@koishijs/plugin-sandbox'
 import * as echo from '@koishijs/plugin-echo'
 
 // 创建一个 Koishi 应用
-const ctx = new Context({
-  port: 5140,
-})
+const ctx = new Context()
 
 // 启用上述插件
+ctx.plugin(server, {
+  port: 5140,
+})                      // 提供后端服务
 ctx.plugin(console)     // 提供控制台
 ctx.plugin(sandbox)     // 提供调试沙盒
 ctx.plugin(echo)        // 提供回声指令