refactor: 确立独立子工程架构 (backend, admin, mpuniapp) 并同步更新 AGENTS.md 规范

mpuniapp/pages/API/exit/exit.uvue

@@ -0,0 +1,23 @@
+<template>
+  <view>
+    <button @tap="exitAppClick">退出应用</button>
+    <text>注:iOS仅在uni-app x SDK模式中支持应用退出</text>
+  </view>
+</template>
+
+<script setup lang="uts">
+  const exitAppClick = () => {
+    uni.exit({
+      success: function (res) {
+        console.log(res)
+      },
+      fail: function(error){
+        console.log(error)
+      }
+    })
+  }
+</script>
+
+<style>
+
+</style>