refactor: 将page-container重命名为root-page-layout

将page-container组件重命名为root-page-layout，并更新所有文档中的引用，以更好地反映其作为页面根布局的角色。已更新AGENTS.md、README.md中的引用，并相应重命名了组件使用指南。

miniprogram/pages/date/date.json

@@ -1,5 +1,5 @@
 {
   "usingComponents": {
-    "page-container": "../../components/page-container/page-container"
+    "root-page-layout": "../../components/root-page-layout/root-page-layout"
   }
 }

miniprogram/pages/date/date.wxml

@@ -1,5 +1,5 @@
 <!--pages/date/date.wxml-->
-<page-container navBarTitle="日期时间格式化示例" navBarBackgroundColor="#123321" navBarTextColor="#ffffff">
+<root-page-layout navBarTitle="日期时间格式化示例" navBarBackgroundColor="#123321" navBarTextColor="#ffffff">
   <view class="container">
     <!-- formatTime 函数示例 -->
     <view class="section">
@@ -69,4 +69,4 @@
       </view>
     </view>
   </view>
-</page-container>
+</root-page-layout>

miniprogram/pages/login/login.json

@@ -3,7 +3,7 @@
   "navigationBarBackgroundColor": "#FFFFFF",
   "navigationBarTextStyle": "black",
   "usingComponents": {
-    "page-container": "../../components/page-container/page-container",
+    "root-page-layout": "../../components/root-page-layout/root-page-layout",
     "t-input": "/miniprogram_npm/tdesign-miniprogram/input/input",
     "t-button": "/miniprogram_npm/tdesign-miniprogram/button/button"
   }

miniprogram/pages/login/login.wxml

@@ -1,5 +1,5 @@
 <!--pages/login/login.wxml-->
-<page-container title="Request 使用示例">
+<root-page-layout title="Request 使用示例">
   <view class="login-container">
     <!-- 登录表单区域 -->
     <view class="form-section">
@@ -27,4 +27,4 @@
       </view>
     </view>
   </view>
-</page-container>
+</root-page-layout>