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/hotkey-handlers.ts

@@ -0,0 +1,67 @@
+// src/main/ipc/hotkey-handlers.ts
+
+import { ipcMain } from 'electron'
+import { IPC_CHANNELS } from '@shared/ipc-channels'
+import { ipcSuccess, ipcError, ErrorCode } from '@shared/errors'
+import { getHotkeyService } from '../services/HotkeyService'
+import { configGet, configSet } from '../services/ConfigService'
+import type { SetHotkeyParams, SetEnabledParams } from '@shared/types'
+
+export function registerHotkeyHandlers(): void {
+  ipcMain.handle(IPC_CHANNELS.HOTKEY.GET_DICTATION_SHORTCUT, async () => {
+    return ipcSuccess(configGet('dictationShortcut'))
+  })
+
+  ipcMain.handle(IPC_CHANNELS.HOTKEY.SET_DICTATION_SHORTCUT, async (_event, params: SetHotkeyParams) => {
+    try {
+      configSet('dictationShortcut', params.binding)
+      getHotkeyService().loadFromConfig()
+      return ipcSuccess(undefined)
+    } catch {
+      return ipcError(ErrorCode.HotkeyRegistrationFailed, 'Failed to set dictation shortcut')
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.HOTKEY.GET_HANDS_FREE_SHORTCUT, async () => {
+    return ipcSuccess(configGet('handsFreeShortcut'))
+  })
+
+  ipcMain.handle(IPC_CHANNELS.HOTKEY.SET_HANDS_FREE_SHORTCUT, async (_event, params: SetHotkeyParams) => {
+    try {
+      configSet('handsFreeShortcut', params.binding)
+      getHotkeyService().loadFromConfig()
+      return ipcSuccess(undefined)
+    } catch {
+      return ipcError(ErrorCode.HotkeyRegistrationFailed, 'Failed to set hands-free shortcut')
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.HOTKEY.GET_COMMAND_SHORTCUT, async () => {
+    return ipcSuccess(configGet('commandShortcut'))
+  })
+
+  ipcMain.handle(IPC_CHANNELS.HOTKEY.SET_COMMAND_SHORTCUT, async (_event, params: SetHotkeyParams) => {
+    try {
+      configSet('commandShortcut', params.binding)
+      getHotkeyService().loadFromConfig()
+      return ipcSuccess(undefined)
+    } catch {
+      return ipcError(ErrorCode.HotkeyRegistrationFailed, 'Failed to set command shortcut')
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.HOTKEY.IS_ENABLED, async () => {
+    return ipcSuccess(configGet('hotkeyEnabled'))
+  })
+
+  ipcMain.handle(IPC_CHANNELS.HOTKEY.SET_ENABLED, async (_event, params: SetEnabledParams) => {
+    configSet('hotkeyEnabled', params.enabled)
+    const hotkey = getHotkeyService()
+    if (params.enabled) {
+      hotkey.start()
+    } else {
+      hotkey.stop()
+    }
+    return ipcSuccess(undefined)
+  })
+}