refactor api and sdk

apps/backend/src/middlewares/errors.ts

@@ -0,0 +1,16 @@
+import { NextFunction, Request, Response } from "express";
+import { HttpError } from "../responses/errors";
+import { MixanErrorResponse } from "@mixan/types";
+
+export const errorHandler = (error: HttpError | Error, req: Request, res: Response, next: NextFunction) => {
+  if(error instanceof HttpError) {
+    return res.status(error.status).json(error.toJson())
+  }
+
+  return res.status(500).json({
+    code: 500,
+    status: 'error',
+    message: error.message || 'Unexpected error occured',
+    issues: []
+  } satisfies MixanErrorResponse);
+};