feat: initial commit with accounts manager project structure

- TypeScript项目基础架构
- API路由和账户管理服务
- 数据库模式和迁移
- 基础配置文件和文档

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

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

src/lib/apiResponse.ts

@@ -0,0 +1,40 @@
+import { ApiResponse, BusinessCode } from '../types/api';
+
+export function createSuccessResponse<T>(data: T, message = 'Success'): ApiResponse<T> {
+  return {
+    code: BusinessCode.Success,
+    message,
+    data,
+  };
+}
+
+export function createErrorResponse(
+  code: BusinessCode,
+  message: string
+): ApiResponse<null> {
+  return {
+    code,
+    message,
+    data: null,
+  };
+}
+
+export function createNoResourceResponse(message = 'No resource found'): ApiResponse<null> {
+  return createErrorResponse(BusinessCode.NoResource, message);
+}
+
+export function createInvalidParamsResponse(message = 'Invalid parameters'): ApiResponse<null> {
+  return createErrorResponse(BusinessCode.InvalidParams, message);
+}
+
+export function createResourceConflictResponse(message = 'Resource conflict'): ApiResponse<null> {
+  return createErrorResponse(BusinessCode.ResourceConflict, message);
+}
+
+export function createPermissionDeniedResponse(message = 'Permission denied'): ApiResponse<null> {
+  return createErrorResponse(BusinessCode.PermissionDenied, message);
+}
+
+export function createBusinessErrorResponse(message = 'Business error'): ApiResponse<null> {
+  return createErrorResponse(BusinessCode.BusinessError, message);
+}