Initial commit: 91dj android client dev_1.0.0

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/tools_base/widget/keep_alive_widget.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/material.dart';
+
+/// 保持widget 活跃
+/// 使用：KeepAliveWidget(widget);
+class KeepAliveWidget extends StatefulWidget {
+  final Widget child;
+
+  const KeepAliveWidget(this.child, {super.key});
+
+  @override
+  State<KeepAliveWidget> createState() => _KeepAliveState();
+}
+
+class _KeepAliveState extends State<KeepAliveWidget> with AutomaticKeepAliveClientMixin {
+  @override
+  bool get wantKeepAlive => true;
+
+  @override
+  Widget build(BuildContext context) {
+    super.build(context);
+    return widget.child;
+  }
+}
+
+extension KeepWrapper on Widget {
+  Widget get keepAlive => KeepAliveWidget(this);
+}