feat(V2-1a): Monorepo 구조 전환 — apps/desktop으로 V1 이동

- npm workspaces 루트 (apps/*, packages/*) 세팅
- V1 전체를 apps/desktop/으로 git mv (src, resources, tests, sidecar,
  scripts, electron.vite.config.ts, electron-builder.yml, vitest.config.ts,
  tsconfig.node.json, tsconfig.web.json)
- apps/desktop/package.json 신규 (name=@d3ro/desktop)
- productName: 'd3ro-voice' 명시 — app.getName()을 고정하여 userData 경로
  %APPDATA%\d3ro-voice\ 그대로 유지 (기존 DB/설정 연속성 보장)
- 루트 package.json을 workspace 루트로 재구성, 공통 devDep만 유지
  (typescript, eslint, prettier)
- turbo.json, tsconfig.base.json 추가 (Turborepo 자체 설치는 별도 sub-phase)
- memory/project_status.md 생성 (규칙 13)

검증:
- npm run typecheck 통과
- npm run build 통과 (electron-vite main+preload+renderer)
- npm run dev 실제 실행 → DB/핫키/Ollama 자동 실행 모두 정상

apps/desktop/src/main/ipc/voice-handlers.ts

@@ -0,0 +1,53 @@
+// src/main/ipc/voice-handlers.ts
+
+import { ipcMain } from 'electron'
+import { IPC_CHANNELS } from '@shared/ipc-channels'
+import { ipcSuccess, ipcError, ErrorCode } from '@shared/errors'
+import { getVoiceModeService } from '../services/VoiceModeService'
+import type { StartRecordingParams, StopRecordingParams, CancelRecordingParams, SetVoiceModeParams } from '@shared/types'
+
+export function registerVoiceHandlers(): void {
+  ipcMain.handle(IPC_CHANNELS.VOICE.START_RECORDING, async (_event, params: StartRecordingParams) => {
+    try {
+      const voice = getVoiceModeService()
+      await voice.startSession('dictation')
+      const session = voice.currentSession
+      return ipcSuccess({ sessionId: session?.id ?? params.sessionId ?? '' })
+    } catch {
+      return ipcError(ErrorCode.AudioCaptureStartFailed, 'Failed to start recording')
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.VOICE.STOP_RECORDING, async (_event, params: StopRecordingParams) => {
+    try {
+      const voice = getVoiceModeService()
+      await voice.stopSession()
+      return ipcSuccess({
+        sessionId: params.sessionId,
+        text: voice.currentSession?.transcription ?? '',
+        durationMs: voice.currentSession ? Date.now() - voice.currentSession.startedAt : 0
+      })
+    } catch {
+      return ipcError(ErrorCode.STTTranscriptionFailed, 'Failed to stop recording')
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.VOICE.CANCEL_RECORDING, async (_event, _params: CancelRecordingParams) => {
+    getVoiceModeService().cancelSession()
+    return ipcSuccess(undefined)
+  })
+
+  ipcMain.handle(IPC_CHANNELS.VOICE.GET_STATE, async () => {
+    return ipcSuccess(getVoiceModeService().getState())
+  })
+
+  ipcMain.handle(IPC_CHANNELS.VOICE.SET_MODE, async (_event, params: SetVoiceModeParams) => {
+    // Phase 2: 모드만 설정에 저장 (실제 모드 전환은 핫키에서 처리)
+    return ipcSuccess(undefined)
+  })
+
+  ipcMain.handle(IPC_CHANNELS.VOICE.GET_MODE, async () => {
+    const voice = getVoiceModeService()
+    return ipcSuccess(voice.currentSession?.mode ?? 'dictation')
+  })
+}