chore: 添加 macOS/Web 平台支持 + 修复编译错误 + 开发环境文档

- 修复 CardTheme → CardThemeData（Flutter 3.41 API 变更）
- 修复 finance_screen 缺少 FormDialog import
- 修复工具栏 Row overflow（添加横向滚动）
- flutter create --platforms=macos,web 生成平台配置
- 添加 docs/dev-setup.md：完整开发环境配置指南
  含 Go/Flutter/Docker 安装、已知 macOS 26 兼容问题及解决方案

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/lib/core/theme/app_theme.dart

@@ -32,7 +32,7 @@ class AppTheme {
         centerTitle: false,
         toolbarHeight: 56,
       ),
-      cardTheme: CardTheme(
+      cardTheme: CardThemeData(
         color: surface,
         elevation: 1,
         shape: RoundedRectangleBorder(

client/lib/screens/finance/finance_screen.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../../widgets/page_scaffold.dart';
 import '../../widgets/data_table_card.dart';
 import '../../core/theme/app_theme.dart';
+import '../../widgets/form_dialog.dart';
 
 class FinanceScreen extends ConsumerStatefulWidget {
   const FinanceScreen({super.key});

client/lib/widgets/data_table_card.dart

@@ -29,8 +29,20 @@ class DataTableCard extends StatelessWidget {
           Container(
             height: 52,
             color: AppTheme.surface,
-            padding: const EdgeInsets.symmetric(horizontal: 12),
-            child: toolbar!,
+            child: SingleChildScrollView(
+              scrollDirection: Axis.horizontal,
+              padding: const EdgeInsets.symmetric(horizontal: 12),
+              child: Row(
+                children: [
+                  ConstrainedBox(
+                    constraints: BoxConstraints(
+                      minWidth: MediaQuery.of(context).size.width - 212 - 24,
+                    ),
+                    child: toolbar!,
+                  ),
+                ],
+              ),
+            ),
           ),
         if (toolbar != null) const Divider(height: 1),
         Expanded(