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/renderer/components/meeting/DocumentTab.tsx

@@ -0,0 +1,89 @@
+// src/renderer/components/meeting/DocumentTab.tsx
+// Phase 14.5: 문서 탭 — MarkdownEditor + 자동저장 + 내보내기
+
+import { useCallback, useRef } from 'react'
+import { Box } from '@mui/material'
+import DeleteIcon from '@mui/icons-material/Delete'
+import { MarkdownEditor } from './MarkdownEditor'
+import { ExportMenu } from './ExportMenu'
+import { PhysicalButton } from '../ds/PhysicalButton'
+import { d3roPalette, d3roTypo } from '../../theme'
+import { useI18n } from '../../i18n'
+import type { MeetingExportFormat } from '@shared/types'
+
+interface DocumentTabDoc {
+  id: string
+  title: string
+  content: string
+  templateType: string
+}
+
+interface DocumentTabProps {
+  document: DocumentTabDoc
+  onContentChange: (content: string) => void
+  onExport: (format: MeetingExportFormat) => void
+  onDelete: () => void
+}
+
+const AUTOSAVE_DELAY = 500
+
+export function DocumentTab({
+  document: doc,
+  onContentChange,
+  onExport,
+  onDelete,
+}: DocumentTabProps): React.ReactElement {
+  const { t } = useI18n()
+  const timerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
+
+  const handleChange = useCallback(
+    (content: string) => {
+      if (timerRef.current) clearTimeout(timerRef.current)
+      timerRef.current = setTimeout(() => {
+        onContentChange(content)
+      }, AUTOSAVE_DELAY)
+    },
+    [onContentChange],
+  )
+
+  return (
+    <Box
+      sx={{
+        display: 'flex',
+        flexDirection: 'column',
+        height: '100%',
+      }}
+    >
+      {/* 콘텐츠 편집기 */}
+      <Box sx={{ flex: 1, overflow: 'hidden', minHeight: 0 }}>
+        <MarkdownEditor
+          content={doc.content}
+          onChange={handleChange}
+        />
+      </Box>
+
+      {/* 하단 액션 바 */}
+      <Box
+        sx={{
+          display: 'flex',
+          justifyContent: 'space-between',
+          alignItems: 'center',
+          mt: 1.5,
+          pt: 1.5,
+          borderTop: `1px solid ${d3roPalette.border.subtle}`,
+        }}
+      >
+        <ExportMenu onExport={onExport} />
+        <PhysicalButton
+          size="small"
+          color="error"
+          onClick={onDelete}
+          sx={{ height: 32, fontSize: d3roTypo.engrave.size }}
+        >
+          <DeleteIcon sx={{ fontSize: 14, mr: 0.5 }} />
+          {t('common.delete')}
+        </PhysicalButton>
+      </Box>
+    </Box>
+  )
+}