refactor: 我的页删除用户卡片，会员卡直接置顶展示

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

lib/features/mine/mine_page.dart

@@ -76,39 +76,12 @@ class _MinePageState extends ConsumerState<MinePage> {
   @override
   Widget build(BuildContext context) {
     final member = ref.watch(memberProvider);
-    final auth = ref.watch(authProvider).value;
-    final scheme = Theme.of(context).colorScheme;
-
-    final rawName = auth?.name?.trim() ?? '';
-    final name = rawName.isEmpty ? '我的' : rawName;
 
     return Scaffold(
       appBar: AppBar(title: const Text('我的')),
       body: ListView(
         padding: const EdgeInsets.all(16),
         children: [
-          Card(
-            color: scheme.primaryContainer.withValues(alpha: 0.4),
-            child: ListTile(
-              leading: CircleAvatar(
-                backgroundColor: scheme.primary,
-                child: Text(
-                  name.characters.first,
-                  style: const TextStyle(color: Colors.white),
-                ),
-              ),
-              title: Text(name,
-                  style: const TextStyle(
-                      fontSize: 17, fontWeight: FontWeight.bold)),
-              subtitle: Text(
-                member.value?.isVip == true
-                    ? '形象会员 · ${member.value!.planName} · 有效期至 ${member.value!.expireAt}'
-                    : '普通用户',
-                style: const TextStyle(fontSize: 12),
-              ),
-            ),
-          ),
-          const SizedBox(height: 12),
           _MemberCard(
             member: member,
             isIOS: _isIOS,