feat(localization): 添加扩展提示相关本地化字段

- 新增 collapsedHint 字段用于折叠状态提示
- 新增 expandedHint 字段用于展开状态提示
- 新增 expansionTileCollapsedHint 字段用于折叠状态下的扩展瓦片提示
- 新增 expansionTileCollapsedTapHint 字段用于折叠状态下点击扩展瓦片的提示
- 新增 expansionTileExpandedHint 字段用于展开状态下的扩展瓦片提示
- 新增 expansionTileExpandedTapHint 字段用于展开状态下点击扩展瓦片的提示

lib/extension/my_cupertino_localizations.dart

@@ -162,6 +162,30 @@ class MyCupertinoLocalizations implements CupertinoLocalizations {
   // TODO: implement timerPickerSecondLabels
   List<String> get timerPickerSecondLabels => throw UnimplementedError();
 
+  @override
+  // TODO: implement collapsedHint
+  String get collapsedHint => throw UnimplementedError();
+
+  @override
+  // TODO: implement expandedHint
+  String get expandedHint => throw UnimplementedError();
+
+  @override
+  // TODO: implement expansionTileCollapsedHint
+  String get expansionTileCollapsedHint => throw UnimplementedError();
+
+  @override
+  // TODO: implement expansionTileCollapsedTapHint
+  String get expansionTileCollapsedTapHint => throw UnimplementedError();
+
+  @override
+  // TODO: implement expansionTileExpandedHint
+  String get expansionTileExpandedHint => throw UnimplementedError();
+
+  @override
+  // TODO: implement expansionTileExpandedTapHint
+  String get expansionTileExpandedTapHint => throw UnimplementedError();
+
 // …其余所有成员：全部 `=> _base.xxx`
 }