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/lifecycle.ts

@@ -0,0 +1,37 @@
+// src/main/lifecycle.ts — 종료 시퀀스
+
+import { app } from 'electron'
+import { getLogger } from './services/LoggerService'
+import { getConfigService } from './services/ConfigService'
+
+const logger = getLogger('lifecycle')
+
+let isQuitting = false
+
+export function getIsQuitting(): boolean {
+  return isQuitting
+}
+
+export function setIsQuitting(value: boolean): void {
+  isQuitting = value
+}
+
+export function setupLifecycle(): void {
+  app.on('before-quit', () => {
+    logger.info('[lifecycle] before-quit')
+    isQuitting = true
+  })
+
+  app.on('will-quit', () => {
+    logger.info('[lifecycle] will-quit — flushing config')
+    try {
+      const configService = getConfigService()
+      if (configService) {
+        // electron-store는 동기적으로 디스크에 쓰므로 별도 flush 불필요
+        logger.info('[lifecycle] config flush complete')
+      }
+    } catch (error) {
+      logger.warn('[lifecycle] config flush failed:', error)
+    }
+  })
+}