feat: 添加关于页面

lib/screens/about_screen.dart

@@ -0,0 +1,45 @@
+import 'package:flutter/material.dart';
+
+class AboutScreen extends StatelessWidget {
+  const AboutScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('关于'),
+      ),
+      body: const Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            Text(
+              '伴享',
+              style: TextStyle(
+                fontSize: 28,
+                fontWeight: FontWeight.bold,
+              ),
+            ),
+            SizedBox(height: 16),
+            Text(
+              '当前版本: 1.1.9+11',
+              style: TextStyle(
+                fontSize: 16,
+                color: Colors.grey,
+              ),
+            ),
+            SizedBox(height: 16),
+            Padding(
+              padding: EdgeInsets.symmetric(horizontal: 32),
+              child: Text(
+                '伴享 — 专为银发族打造的社交平台',
+                textAlign: TextAlign.center,
+                style: TextStyle(fontSize: 16),
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/screens/profile_screen.dart

@@ -3,6 +3,7 @@ import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
+import 'about_screen.dart';
 import 'profile_setup_screen.dart';
 
 class ProfileScreen extends StatefulWidget {
@@ -127,6 +128,17 @@ class _ProfileScreenState extends State<ProfileScreen> {
                       ),
                     ),
             ),
+            // 关于入口
+            ListTile(
+              leading: const Icon(Icons.info_outline),
+              title: const Text('关于'),
+              trailing: const Icon(Icons.chevron_right),
+              onTap: () {
+                Navigator.of(context).push(
+                  MaterialPageRoute(builder: (_) => const AboutScreen()),
+                );
+              },
+            ),
             Padding(
               padding: const EdgeInsets.fromLTRB(24, 0, 24, 24),
               child: SizedBox(