feat: improve error returning and parsing logic

app/server/headscale/api-client.ts

@@ -1,6 +1,7 @@
 import { readFile } from 'node:fs/promises';
 import { Agent, Dispatcher, request } from 'undici';
 import log from '~/utils/log';
+import ResponseError from './api-error';
 
 export async function createApiClient(base: string, certPath?: string) {
 	if (!certPath) {
@@ -20,20 +21,6 @@ export async function createApiClient(base: string, certPath?: string) {
 	}
 }
 
-// Represents an error that occurred during a response
-// Thrown when status codes are >= 400
-export class ResponseError extends Error {
-	status: number;
-	response: string;
-
-	constructor(status: number, response: string) {
-		super(`Response Error (${status}): ${response}`);
-		this.name = 'ResponseError';
-		this.status = status;
-		this.response = response;
-	}
-}
-
 export class ApiClient {
 	private agent: Agent;
 	private base: string;