feat: migrate runtime backend to node server

server-node/src/errors.ts

@@ -0,0 +1,35 @@
+export class HttpError extends Error {
+  statusCode: number;
+  expose: boolean;
+
+  constructor(statusCode: number, message: string, expose = true) {
+    super(message);
+    this.name = 'HttpError';
+    this.statusCode = statusCode;
+    this.expose = expose;
+  }
+}
+
+export function badRequest(message: string) {
+  return new HttpError(400, message);
+}
+
+export function unauthorized(message = '未授权访问') {
+  return new HttpError(401, message);
+}
+
+export function forbidden(message = '禁止访问') {
+  return new HttpError(403, message);
+}
+
+export function notFound(message = '资源不存在') {
+  return new HttpError(404, message);
+}
+
+export function conflict(message: string) {
+  return new HttpError(409, message);
+}
+
+export function upstreamError(message: string) {
+  return new HttpError(502, message);
+}