// CRITICALimport { chmod, readFile, writeFile } from "fs/promises";import { existsSync } from "fs";import { resolveSettingsDefaultBackendUrl } from "./backend-config";import { resolveDataDir, resolveSettingsFilePath } from "./data-dir"; export interface ApiSettings {  backendUrl: string;  apiKey: string;  voiceUrl: string;  voiceModel: string;} const DEFAULT_SETTINGS: ApiSettings = {  backendUrl: resolveSettingsDefaultBackendUrl(),  apiKey: process.env.API_KEY || "",  voiceUrl: process.env.VOICE_URL || process.env.NEXT_PUBLIC_VOICE_URL || "",  voiceModel:    process.env.VOICE_MODEL || process.env.NEXT_PUBLIC_VOICE_MODEL || "whisper-large-v3-turbo",}; export async function getApiSettings(): Promise<ApiSettings> {  const settingsFile = resolveSettingsFilePath();  if (!existsSync(settingsFile)) return DEFAULT_SETTINGS;  try {    const saved = JSON.parse(await readFile(settingsFile, "utf-8")) as Partial<ApiSettings>;    return {      backendUrl: saved.backendUrl || DEFAULT_SETTINGS.backendUrl,      apiKey: saved.apiKey || DEFAULT_SETTINGS.apiKey,      voiceUrl: saved.voiceUrl || DEFAULT_SETTINGS.voiceUrl,      voiceModel: saved.voiceModel || DEFAULT_SETTINGS.voiceModel,    };  } catch (error) {    console.error(`[API Settings] Failed to read ${settingsFile}:`, error);    return DEFAULT_SETTINGS;  }} export async function saveApiSettings(settings: ApiSettings): Promise<void> {  resolveDataDir();  const settingsFile = resolveSettingsFilePath();  const payload = JSON.stringify(settings, null, 2);  await writeFile(settingsFile, payload, "utf-8");  await chmod(settingsFile, 0o600).catch(() => undefined);} // Mask API key for display (show first 4 and last 4 chars)export function maskApiKey(key: string): string {  if (!key || key.length < 12) return key ? "••••••••" : "";  return `${key.slice(0, 4)}••••${key.slice(-4)}`;}