feat: app 端 ui 设计完成

wei_ai_app/lib/models/character.dart

@@ -0,0 +1,23 @@
+class Character {
+  final String id;
+  final String name;
+  final String tagline;
+  final String avatar;
+  final String description;
+  final List<String> tags;
+  final double compatibility; // 硬件契合度 %
+  final String status; // 'online' | 'busy' | 'offline'
+  final bool isLocked;
+
+  const Character({
+    required this.id,
+    required this.name,
+    required this.tagline,
+    required this.avatar,
+    required this.description,
+    required this.tags,
+    required this.compatibility,
+    required this.status,
+    this.isLocked = false,
+  });
+}