refactor: move download engine to lib directory for better organization

src/main/index.ts

@@ -5,8 +5,8 @@ import log from 'electron-log/main'
 import { autoUpdater } from 'electron-updater'
 import appIcon from '../../build/icon.png?asset'
 import { configureLogger } from './config/logger-config'
-import { downloadEngine } from './download-engine'
 import { services } from './ipc'
+import { downloadEngine } from './lib/download-engine'
 import { ytdlpManager } from './lib/ytdlp-manager'
 import { settingsManager } from './settings'
 import { createTray, destroyTray } from './tray'

src/main/ipc/services/download-service.ts

@@ -6,7 +6,7 @@ import type {
   PlaylistInfo,
   VideoInfo
 } from '../../../shared/types'
-import { downloadEngine } from '../../download-engine'
+import { downloadEngine } from '../../lib/download-engine'
 
 class DownloadService extends IpcService {
   static readonly groupName = 'download'

src/main/lib/download-engine.ts

@@ -10,18 +10,18 @@ import type {
   PlaylistInfo,
   VideoFormat,
   VideoInfo
-} from '../shared/types'
-import { buildDownloadArgs } from './download-engine/args-builder'
+} from '../../shared/types'
+import { buildDownloadArgs } from '../download-engine/args-builder'
 import {
   findFormatByIdCandidates,
   parseSizeToBytes,
   resolveSelectedFormat
-} from './download-engine/format-utils'
-import { DownloadQueue } from './lib/download-queue'
-import { historyManager } from './lib/history-manager'
-import { ytdlpManager } from './lib/ytdlp-manager'
-import { settingsManager } from './settings'
-import { scopedLoggers } from './utils/logger'
+} from '../download-engine/format-utils'
+import { settingsManager } from '../settings'
+import { scopedLoggers } from '../utils/logger'
+import { DownloadQueue } from './download-queue'
+import { historyManager } from './history-manager'
+import { ytdlpManager } from './ytdlp-manager'
 
 interface DownloadProcess {
   controller: AbortController