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/services/LoggerService.ts

@@ -0,0 +1,32 @@
+// src/main/services/LoggerService.ts
+// electron-log 래퍼. 카테고리별 로깅을 지원한다.
+
+import log from 'electron-log'
+
+export interface CategoryLogger {
+  info(message: string, ...args: unknown[]): void
+  warn(message: string, ...args: unknown[]): void
+  error(message: string, ...args: unknown[]): void
+  debug(message: string, ...args: unknown[]): void
+}
+
+let initialized = false
+
+export function initLoggerService(): void {
+  if (initialized) return
+  initialized = true
+
+  log.transports.file.maxSize = 5 * 1024 * 1024 // 5MB
+  log.transports.file.format = '[{y}-{m}-{d} {h}:{i}:{s}.{ms}] [{level}] {text}'
+  log.transports.console.format = '[{h}:{i}:{s}.{ms}] [{level}] {text}'
+}
+
+export function getLogger(category: string): CategoryLogger {
+  const prefix = `[${category}]`
+  return {
+    info: (message: string, ...args: unknown[]) => log.info(`${prefix} ${message}`, ...args),
+    warn: (message: string, ...args: unknown[]) => log.warn(`${prefix} ${message}`, ...args),
+    error: (message: string, ...args: unknown[]) => log.error(`${prefix} ${message}`, ...args),
+    debug: (message: string, ...args: unknown[]) => log.debug(`${prefix} ${message}`, ...args)
+  }
+}