refactor: 整合财务系统到主应用并重构后端架构

主要变更:
- 将独立的 web-finance 应用整合到 web-antd 主应用中
- 重命名 backend-mock 为 backend,增强后端功能
- 新增财务模块 API 端点(账户、预算、类别、交易)
- 增强财务仪表板和报表功能
- 添加 SQLite 数据存储支持和财务数据导入脚本
- 优化路由结构,删除冗余的 finance-system 模块

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/backend/nitro.config.ts

@@ -0,0 +1,20 @@
+import errorHandler from './error';
+
+process.env.COMPATIBILITY_DATE = new Date().toISOString();
+export default defineNitroConfig({
+  devErrorHandler: errorHandler,
+  errorHandler: '~/error',
+  routeRules: {
+    '/api/**': {
+      cors: true,
+      headers: {
+        'Access-Control-Allow-Credentials': 'true',
+        'Access-Control-Allow-Headers':
+          'Accept, Authorization, Content-Length, Content-Type, If-Match, If-Modified-Since, If-None-Match, If-Unmodified-Since, X-CSRF-TOKEN, X-Requested-With',
+        'Access-Control-Allow-Methods': 'GET,HEAD,PUT,PATCH,POST,DELETE',
+        'Access-Control-Allow-Origin': '*',
+        'Access-Control-Expose-Headers': '*',
+      },
+    },
+  },
+});