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/system-handlers.ts

@@ -0,0 +1,28 @@
+// src/main/ipc/system-handlers.ts
+
+import { ipcMain, app, systemPreferences } from 'electron'
+import { IPC_CHANNELS } from '@shared/ipc-channels'
+import { ipcSuccess } from '@shared/errors'
+import type { PermissionStatus } from '@shared/types'
+
+export function registerSystemHandlers(): void {
+  ipcMain.handle(IPC_CHANNELS.SYSTEM.GET_PLATFORM, async () => {
+    return ipcSuccess(process.platform)
+  })
+
+  ipcMain.handle(IPC_CHANNELS.SYSTEM.GET_VERSION, async () => {
+    return ipcSuccess(app.getVersion())
+  })
+
+  ipcMain.handle(IPC_CHANNELS.SYSTEM.CHECK_MIC_PERMISSION, async () => {
+    let status: PermissionStatus = 'unknown'
+    if (process.platform === 'darwin') {
+      const macStatus = systemPreferences.getMediaAccessStatus('microphone')
+      status = macStatus === 'granted' ? 'granted' : macStatus === 'denied' ? 'denied' : 'unknown'
+    } else {
+      // Windows: 마이크 권한은 별도 체크 불필요 (시스템 설정에서 관리)
+      status = 'granted'
+    }
+    return ipcSuccess(status)
+  })
+}