Add AI DEV Node deployment foundation

server/http/apiResponse.ts

@@ -0,0 +1,15 @@
+import type { Response } from 'express';
+
+export interface ApiResponse<T> {
+  code: number;
+  message: string;
+  data: T | null;
+}
+
+export function ok<T>(res: Response, data: T, message = 'OK'): void {
+  res.status(200).json({ code: 200, message, data } satisfies ApiResponse<T>);
+}
+
+export function created<T>(res: Response, data: T, message = 'CREATED'): void {
+  res.status(201).json({ code: 201, message, data } satisfies ApiResponse<T>);
+}

server/http/errors.ts

@@ -0,0 +1,33 @@
+import type { NextFunction, Request, Response } from 'express';
+
+export class ApiError extends Error {
+  constructor(
+    public readonly status: number,
+    message: string,
+  ) {
+    super(message);
+  }
+}
+
+export function errorHandler(
+  error: unknown,
+  _req: Request,
+  res: Response,
+  _next: NextFunction,
+): void {
+  if (error instanceof ApiError) {
+    res.status(error.status).json({
+      code: error.status,
+      message: error.message,
+      data: null,
+    });
+    return;
+  }
+
+  console.error(error);
+  res.status(500).json({
+    code: 500,
+    message: 'Internal server error',
+    data: null,
+  });
+}