// CRITICALimport { readFile, writeFile, mkdir } from "fs/promises";import { existsSync } from "fs";import path from "path"; export interface ApiSettings {  backendUrl: string;  apiKey: string;  voiceUrl: string;  voiceModel: string;} const DEFAULT_SETTINGS: ApiSettings = {  backendUrl: process.env.BACKEND_URL || process.env.NEXT_PUBLIC_API_URL || "http://localhost:8080",  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",}; // Settings file path - try multiple locations to support dev, monorepo, and standalone buildsconst DATA_DIR_CANDIDATES = [  process.env.VLLM_STUDIO_DATA_DIR,  path.join(process.cwd(), "data"),  path.join(process.cwd(), "..", "data"),  path.join(process.cwd(), "frontend", "data"),].filter((dir): dir is string => Boolean(dir)); function resolveSettingsFile() {  for (const dir of DATA_DIR_CANDIDATES) {    const settingsFile = path.join(dir, "api-settings.json");    if (existsSync(settingsFile)) {      return { dataDir: dir, settingsFile };    }  }   const fallbackDir = DATA_DIR_CANDIDATES[0] || path.join(process.cwd(), "data");  return {    dataDir: fallbackDir,    settingsFile: path.join(fallbackDir, "api-settings.json"),  };} export async function getApiSettings(): Promise<ApiSettings> {  try {    const { settingsFile } = resolveSettingsFile();    if (existsSync(settingsFile)) {      const content = await readFile(settingsFile, "utf-8");      const saved = JSON.parse(content) as Partial<ApiSettings>;      // Merge with defaults (env vars still take precedence if settings file has empty values)      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 settings file:", error);  }  return DEFAULT_SETTINGS;} export async function saveApiSettings(settings: ApiSettings): Promise<void> {  try {    const { dataDir, settingsFile } = resolveSettingsFile();    // Ensure data directory exists    if (!existsSync(dataDir)) {      await mkdir(dataDir, { recursive: true });    }    await writeFile(settingsFile, JSON.stringify(settings, null, 2), "utf-8");  } catch (error) {    console.error("[API Settings] Failed to save settings file:", error);    throw error;  }} // 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)}`;}