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/hooks/useProFeature.ts

@@ -0,0 +1,54 @@
+// src/renderer/hooks/useProFeature.ts
+// Pro feature gating hook: checks access, subscribes to tier changes
+
+import { useState, useEffect, useCallback } from 'react'
+import { Feature } from '@shared/types'
+import type { FeatureAccess } from '@shared/types'
+
+interface UseProFeatureResult {
+  /** Feature is unlocked for current tier */
+  unlocked: boolean
+  /** Loading initial access check */
+  loading: boolean
+  /** Full access info (null while loading) */
+  access: FeatureAccess | null
+  /** Opens the license modal (dispatches custom event) */
+  showUpgrade: () => void
+}
+
+export function useProFeature(feature: Feature): UseProFeatureResult {
+  const [access, setAccess] = useState<FeatureAccess | null>(null)
+  const [loading, setLoading] = useState(true)
+
+  const checkAccess = useCallback(() => {
+    window.electronAPI.license.checkFeature(feature).then((result) => {
+      if (result.success) {
+        setAccess(result.data)
+      }
+      setLoading(false)
+    })
+  }, [feature])
+
+  useEffect(() => {
+    checkAccess()
+
+    // Re-check when tier changes
+    const unsub = window.electronAPI.license.onTierChanged(() => {
+      checkAccess()
+    })
+
+    return unsub
+  }, [checkAccess])
+
+  const showUpgrade = useCallback(() => {
+    // Dispatch custom event that LicenseModal listens to
+    window.dispatchEvent(new CustomEvent('d3ro:open-license-modal'))
+  }, [])
+
+  return {
+    unlocked: access?.allowed ?? false,
+    loading,
+    access,
+    showUpgrade,
+  }
+}