feat(app): 形象照片上传 + 身形设置 + 化身构建 + 衣橱管理

- photo_upload_provider/photo_guide_page：4 类照片（大头照/正面/侧面/背面）拍照或相册上传
- body_provider/body_tune_page：身高 145-200cm / 体重 / 肤色 1-5 滑杆设置
- avatar_provider：化身构建（同步 + 异步轮询兜底）
- profile_page：形象主页聚合化身/照片/身形状态 + 登出
- wardrobe_provider/wardrobe_page/wardrobe_upload_page：网格展示 + 分类筛选 + 长按删除 + 表单上传
- AppConfig.resolveUrl 相对路径拼接；新增 /photo-guide /body-tune /wardrobe-upload 路由

lib/shared/widgets/empty_view.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/material.dart';
+
+/// 空态 + 引导动作
+class EmptyView extends StatelessWidget {
+  final String message;
+  final String? actionText;
+  final VoidCallback? onAction;
+
+  const EmptyView({
+    super.key,
+    required this.message,
+    this.actionText,
+    this.onAction,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Icon(Icons.inbox_outlined, size: 48, color: Colors.grey.shade400),
+          const SizedBox(height: 12),
+          Text(message, style: const TextStyle(color: Colors.grey)),
+          if (actionText != null && onAction != null) ...[
+            const SizedBox(height: 16),
+            FilledButton(onPressed: onAction, child: Text(actionText!)),
+          ],
+        ],
+      ),
+    );
+  }
+}

lib/shared/widgets/error_view.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/material.dart';
+
+/// 错误态 + 重试
+class ErrorView extends StatelessWidget {
+  final String message;
+  final VoidCallback? onRetry;
+
+  const ErrorView({super.key, required this.message, this.onRetry});
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Icon(Icons.error_outline, size: 48, color: Colors.grey.shade400),
+          const SizedBox(height: 12),
+          Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 32),
+            child: Text(message,
+                textAlign: TextAlign.center,
+                style: const TextStyle(color: Colors.grey)),
+          ),
+          if (onRetry != null) ...[
+            const SizedBox(height: 16),
+            OutlinedButton.icon(
+                onPressed: onRetry, icon: const Icon(Icons.refresh), label: const Text('重试')),
+          ],
+        ],
+      ),
+    );
+  }
+}

lib/shared/widgets/loading_view.dart

@@ -0,0 +1,24 @@
+import 'package:flutter/material.dart';
+
+/// 加载骨架屏
+class LoadingView extends StatelessWidget {
+  final String? text;
+
+  const LoadingView({super.key, this.text});
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          const CircularProgressIndicator(),
+          if (text != null) ...[
+            const SizedBox(height: 12),
+            Text(text!, style: const TextStyle(color: Colors.grey)),
+          ],
+        ],
+      ),
+    );
+  }
+}