Phase 1+2 구현: Electron 뼈대 + STT/핫키/오케스트레이터

Phase 1:
- 프로젝트 초기화 (TypeScript strict, electron-vite, ESLint, Prettier)
- shared 타입 (ipc-channels 113채널, types, errors, constants)
- 메인 프로세스 뼈대 (bootstrap, lifecycle, 단일 인스턴스)
- LoggerService, ConfigService (electron-store ESM dynamic import)
- React 19 + MUI 7 Dashboard, 시스템 트레이

Phase 2:
- AudioCaptureService (node-record-lpcm16, PCM16 16kHz mono)
- HotkeyService (uiohook-napi, 더블프레스, holdMode/toggleMode)
- LocalSTTService (faster-whisper Python sidecar, 이중 조건 플러시)
- VoiceModeService 오케스트레이터 (이중 상태머신, Action Queue)
- Python sidecar (FastAPI: health/load/transcribe/shutdown)
- IPC 핸들러 (voice, stt, hotkey) + Preload API 확장

src/main/windows/WindowManager.ts

@@ -0,0 +1,66 @@
+// src/main/windows/WindowManager.ts
+
+import { BrowserWindow, shell } from 'electron'
+import { join } from 'path'
+import { is } from '@electron-toolkit/utils'
+import { WINDOW_SIZE } from '@shared/constants'
+import { getLogger } from '../services/LoggerService'
+import { getIsQuitting, setIsQuitting } from '../lifecycle'
+import { configGet } from '../services/ConfigService'
+
+const logger = getLogger('WindowManager')
+
+let mainWindow: BrowserWindow | null = null
+
+export function getMainWindow(): BrowserWindow | null {
+  return mainWindow
+}
+
+export function createMainWindow(): BrowserWindow {
+  mainWindow = new BrowserWindow({
+    width: WINDOW_SIZE.MAIN.width,
+    height: WINDOW_SIZE.MAIN.height,
+    minWidth: 800,
+    minHeight: 600,
+    show: false,
+    autoHideMenuBar: true,
+    webPreferences: {
+      preload: join(__dirname, '../preload/index.js'),
+      sandbox: false,
+      contextIsolation: true,
+      nodeIntegration: false
+    }
+  })
+
+  mainWindow.on('ready-to-show', () => {
+    mainWindow?.show()
+    logger.info('Main window shown')
+  })
+
+  mainWindow.on('close', (event) => {
+    if (!getIsQuitting() && configGet('closeToTray')) {
+      event.preventDefault()
+      mainWindow?.hide()
+      logger.info('Main window hidden to tray')
+    }
+  })
+
+  mainWindow.on('closed', () => {
+    mainWindow = null
+  })
+
+  mainWindow.webContents.setWindowOpenHandler((details) => {
+    shell.openExternal(details.url)
+    return { action: 'deny' }
+  })
+
+  // 개발/프로덕션 URL 로드
+  if (is.dev && process.env['ELECTRON_RENDERER_URL']) {
+    mainWindow.loadURL(process.env['ELECTRON_RENDERER_URL'])
+  } else {
+    mainWindow.loadFile(join(__dirname, '../renderer/index.html'))
+  }
+
+  logger.info('Main window created')
+  return mainWindow
+}