feat(V2-1b): packages/core 추출 — 공유 타입/에러/채널/유틸 분리

packages/core (@d3ro/core) 신규 생성:
- types.ts, errors.ts, ipc-channels.ts, constants.ts (shared에서 이동)
- utils/meeting-markdown.ts, utils/markdown-to-docx.ts (main/utils에서 이동)
- subpath exports 정의 (./types, ./errors, ./ipc-channels, ./constants,
  ./utils/meeting-markdown, ./utils/markdown-to-docx)
- src/index.ts barrel export 추가
- docx를 core 자체 dependency로 선언

apps/desktop 연결:
- package.json에 @d3ro/core: '*' dep 추가
- tsconfig.node/web.json paths에 @d3ro/core/* 추가
- electron.vite.config.ts 3개 섹션 alias 추가 (main/preload/renderer)
- externalizeDepsPlugin exclude에 @d3ro/core (workspace 소스 번들 대상)
- vitest.config.ts alias 추가

일괄 치환 (79 파일, 167건):
- @shared/{types,errors,ipc-channels,constants} → @d3ro/core/*
- static/dynamic import + type expression import 모두 포함
- MeetingModeService.ts의 ../utils/* 상대 경로 → @d3ro/core/utils/*
- @shared/theme-vars는 V2-1c 범위로 남김 (WindowManager만 사용)

M1 수정 포함:
- electron.vite.config.ts의 resolve('src/shared') → resolve(__dirname, ...)
  CWD 독립적으로 동작하도록 견고화

검증:
- typecheck 통과
- build 통과 (main+preload+renderer)
- dev 런타임 → DB/핫키/Ollama 모두 정상, 기존 데이터 연속성 유지

apps/desktop/src/main/services/VoiceModeService.ts

@@ -17,10 +17,10 @@ import type { HotkeyConfig } from './HotkeyService'
 import { configGet } from './ConfigService'
 import { getTextInsertService } from './TextInsertService'
 import { getLocalLLMService } from './LocalLLMService'
-import { D3ROError, ErrorCode } from '@shared/errors'
-import { TIMING } from '@shared/constants'
-import { RecognitionState, AudioState } from '@shared/types'
-import type { VoiceMode, VoiceState } from '@shared/types'
+import { D3ROError, ErrorCode } from '@d3ro/core/errors'
+import { TIMING } from '@d3ro/core/constants'
+import { RecognitionState, AudioState } from '@d3ro/core/types'
+import type { VoiceMode, VoiceState } from '@d3ro/core/types'
 import {
   showRecordingTip,
   hideRecordingTip,
@@ -28,7 +28,7 @@ import {
   sendAudioLevelToTip,
   showResultPopup,
 } from '../windows/WindowManager'
-import type { ScreenContext } from '@shared/types'
+import type { ScreenContext } from '@d3ro/core/types'
 
 const logger = getLogger('VoiceModeService')
 
@@ -189,7 +189,7 @@ class VoiceModeService extends EventEmitter {
     // Phase 11: 라이센스 쿼터 체크
     try {
       const { getLicenseService } = await import('./LicenseService')
-      const { Feature } = await import('@shared/types')
+      const { Feature } = await import('@d3ro/core/types')
       const license = getLicenseService()
       const access = license.canUse(Feature.DICTATION)
       if (!access.allowed) {
@@ -220,7 +220,7 @@ class VoiceModeService extends EventEmitter {
       const { getScreenContextService } = await import('./ScreenContextService')
       const ctx = getScreenContextService()
       if (ctx.isEnabled()) {
-        const captureSelected = configGet('screenContextEnabled' as keyof import('@shared/types').AppConfig) as unknown as boolean
+        const captureSelected = configGet('screenContextEnabled' as keyof import('@d3ro/core/types').AppConfig) as unknown as boolean
         const result = await ctx.captureContext(captureSelected)
         screenContext = result.context
         logger.info(`Screen context captured: ${screenContext.appName ?? 'unknown'}`)
@@ -555,7 +555,7 @@ class VoiceModeService extends EventEmitter {
       if (action === 'chain') {
         try {
           const { getChainService } = await import('./ChainService')
-          const activeChainId = configGet('activeChainId' as keyof import('@shared/types').AppConfig) as unknown as string
+          const activeChainId = configGet('activeChainId' as keyof import('@d3ro/core/types').AppConfig) as unknown as string
           if (activeChainId) {
             const chainResult = await getChainService().execute(activeChainId, contextPrefix + transcribedText)
             if (this._isInTerminalState()) return
@@ -572,7 +572,7 @@ class VoiceModeService extends EventEmitter {
 
       // 음성 단축키 오버라이드 또는 활성 명령어
       const effectiveInstructionId = overrideInstructionId
-        ?? (configGet('activeInstructionId' as keyof import('@shared/types').AppConfig) as unknown as string)
+        ?? (configGet('activeInstructionId' as keyof import('@d3ro/core/types').AppConfig) as unknown as string)
 
       if (action === 'custom' || overrideInstructionId) {
         let customPrompt = contextPrefix + transcribedText