feat: 完成智能电网电工端 Flutter 应用初始化

创建完整的 Flutter 项目结构，包含 Android 和 iOS 平台配置、核心网络层、路由、状态管理及业务模块（订单、收益、认证），适配原 uni-app 项目功能逻辑

lib/shared/widgets/x_card.dart

@@ -0,0 +1,59 @@
+import 'package:flutter/material.dart';
+
+import '../../core/theme/app_colors.dart';
+import '../../core/theme/app_dimens.dart';
+
+/// 各页面 `.ios-card` 的等价实现：白底 + 浅描边 + 圆角 + 极淡阴影。
+class XCard extends StatelessWidget {
+  const XCard({
+    super.key,
+    required this.child,
+    this.padding,
+    this.margin,
+    this.radius = AppRadius.xl,
+    this.background = AppColors.surfaceContainerLowest,
+    this.borderColor = AppColors.borderSoft,
+    this.shadows = AppShadows.card,
+    this.onTap,
+  });
+
+  final Widget child;
+  final EdgeInsetsGeometry? padding;
+  final EdgeInsetsGeometry? margin;
+  final double radius;
+  final Color background;
+  final Color borderColor;
+
+  /// 订单卡片用 [AppShadows.orderCard]（0 2px 8px），其余用 [AppShadows.card]。
+  final List<BoxShadow> shadows;
+  final VoidCallback? onTap;
+
+  @override
+  Widget build(BuildContext context) {
+    final r = BorderRadius.circular(radius);
+    final content = Container(
+      padding: padding,
+      decoration: BoxDecoration(
+        color: background,
+        border: Border.all(color: borderColor),
+        borderRadius: r,
+        boxShadow: shadows,
+      ),
+      child: child,
+    );
+
+    return Padding(
+      padding: margin ?? EdgeInsets.zero,
+      child: onTap == null
+          ? content
+          : Material(
+              color: Colors.transparent,
+              child: InkWell(
+                onTap: onTap,
+                borderRadius: r,
+                child: content,
+              ),
+            ),
+    );
+  }
+}