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/ipc/index.ts

@@ -0,0 +1,23 @@
+// src/main/ipc/index.ts — IPC 핸들러 일괄 등록
+
+import { registerAudioHandlers } from './audio-handlers'
+import { registerConfigHandlers } from './config-handlers'
+import { registerWindowHandlers } from './window-handlers'
+import { registerSystemHandlers } from './system-handlers'
+import { registerVoiceHandlers } from './voice-handlers'
+import { registerSTTHandlers } from './stt-handlers'
+import { registerHotkeyHandlers } from './hotkey-handlers'
+import { getLogger } from '../services/LoggerService'
+
+const logger = getLogger('ipc')
+
+export function registerAllIpcHandlers(): void {
+  registerAudioHandlers()
+  registerConfigHandlers()
+  registerWindowHandlers()
+  registerSystemHandlers()
+  registerVoiceHandlers()
+  registerSTTHandlers()
+  registerHotkeyHandlers()
+  logger.info('All IPC handlers registered')
+}