update docs/tutorial/app-manifest.md

docs/tutorial/app-manifest.md

+
+### 完整 manifest.json
 ```json
 {
     "id": "__UNI__XXXXXXX",         //必填，字符串类型，DCloud平台分配的应用标识
@@ -14,6 +16,12 @@
         "nvue": {                       //可选，JSON对象，nvue页面相关配置
             "flex-direction": "row"             //可选，字符串类型，nvue页面的flex-direction默认值，可取值row、row-reverse、column、column-reverse
         },
+        "optimization": {               //可选，JSON对象，分包配置
+            "subPackages": true                 //可选，Boolean类型，是否开启分包优化，参考：https://uniapp.dcloud.io/collocation/pages.html#subpackages
+        },
+        "uniStatistics": {              //可选，JSON对象，uni统计配置
+            "enable": true,                     //可选，Boolean类型，是否开启uni统计
+        },
         "screenOrientation": [          //可选，字符串数组类型，应用支持的横竖屏
             "portrait-primary",                 //可选，字符串类型，支持竖屏
             "portrait-secondary",               //可选，字符串类型，支持反向竖屏