Phase 10~11 전체 구현: 킬러 피처 5종 + 수익화 시스템

Phase 10 킬러 피처:
- MemoService: 태그 CRUD + 마크다운 내보내기 (memo_tags DB)
- VoiceCommandService: 키워드→명령어 매칭, 프리셋 4종
- ScreenContextService: PowerShell 활성 윈도우 + Ctrl+C 선택 텍스트
- ChainService: LLM 명령어 순차 실행 파이프라인
- CaptionService: 6초 청크 연속 전사 + 시스템 오디오 루프백

VoiceModeService 파이프라인 통합:
- 녹음 시작 → 컨텍스트 캡처 → STT → 키워드 매칭 → LLM(체인/컨텍스트 주입) → 삽입

시스템 오디오 캡처:
- setDisplayMediaRequestHandler + audio: 'loopback' (IPC 브릿지)
- electron-audio-loopback 패키지 contextIsolation 호환 불가 → 직접 구현

Phase 11 수익화:
- LicenseService: Free/Pro/Pro+ 3티어, LemonSqueezy API
- Feature Gate: requireFeature/checkFeature/consumeFeature
- 일일 쿼터: Free dictation 20/일, LLM 10/일 (SQLite daily_usage)
- LicenseModal, ProBadge, UpgradePromptModal UI

디자인 보강:
- d3roTypo(13종), d3roShadow(10종), d3roRadius(7종) 토큰 시스템
- ScreenPanel, ButtonGroup DS 컴포넌트 신규
- PhosphorText 4→13종 변형, MetalDial conic-gradient 광택
- 공유 컴포넌트: EmptyStateCard, SearchInput, PageHeader, HistoryEntryCard

기타:
- 자막 핫키 SSOT 전체 연동 (Config→Hotkey→VoiceMode→Caption→Settings)
- StatusBar 자막 LED + 효과음, 자막 로딩 UI
- LLM 상태 이벤트 전파 수정 (폴링 제거 → onStatusChanged)
- 커맨드 팝업 "선택 해제" 항목 추가

src/main/ipc/license-handlers.ts

@@ -0,0 +1,100 @@
+// src/main/ipc/license-handlers.ts
+// Phase 11: 라이센스 IPC 핸들러
+
+import { ipcMain, BrowserWindow } from 'electron'
+import { IPC_CHANNELS } from '@shared/ipc-channels'
+import { ipcSuccess, ipcError, ErrorCode } from '@shared/errors'
+import { getLicenseService } from '../services/LicenseService'
+import type {
+  ActivateLicenseParams,
+  UpgradePromptEvent,
+  LicenseInfo,
+} from '@shared/types'
+import { Feature } from '@shared/types'
+
+/** 업그레이드 유도 이벤트를 모든 렌더러에 broadcast */
+function broadcastUpgradePrompt(event: UpgradePromptEvent): void {
+  for (const win of BrowserWindow.getAllWindows()) {
+    win.webContents.send(IPC_CHANNELS.LICENSE.UPGRADE_PROMPT, event)
+  }
+}
+
+/** 티어 변경을 모든 렌더러에 broadcast */
+function broadcastTierChanged(info: LicenseInfo): void {
+  for (const win of BrowserWindow.getAllWindows()) {
+    win.webContents.send(IPC_CHANNELS.LICENSE.TIER_CHANGED, info)
+  }
+}
+
+export function registerLicenseHandlers(): void {
+  const license = getLicenseService()
+
+  // 이벤트 -> 렌더러 전파
+  license.on('upgrade-prompt', (event: UpgradePromptEvent) => {
+    broadcastUpgradePrompt(event)
+  })
+
+  license.on('tier-changed', (info: LicenseInfo) => {
+    broadcastTierChanged(info)
+  })
+
+  // ── handle 채널 ──
+
+  ipcMain.handle(IPC_CHANNELS.LICENSE.GET_INFO, async () => {
+    try {
+      return ipcSuccess(license.getInfo())
+    } catch (err) {
+      return ipcError(ErrorCode.UnknownError, `Failed to get license info: ${err}`)
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.LICENSE.ACTIVATE, async (_event, params: ActivateLicenseParams) => {
+    try {
+      const result = await license.activate(params.licenseKey)
+      return ipcSuccess(result)
+    } catch (err) {
+      return ipcError(ErrorCode.LicenseActivationFailed, `Activation failed: ${err}`)
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.LICENSE.DEACTIVATE, async () => {
+    try {
+      await license.deactivate()
+      return ipcSuccess(undefined)
+    } catch (err) {
+      return ipcError(ErrorCode.LicenseDeactivationFailed, `Deactivation failed: ${err}`)
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.LICENSE.CHECK_FEATURE, async (_event, params: { feature: Feature }) => {
+    try {
+      return ipcSuccess(license.canUse(params.feature))
+    } catch (err) {
+      return ipcError(ErrorCode.UnknownError, `Feature check failed: ${err}`)
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.LICENSE.GET_USAGE, async (_event, params: { feature: Feature }) => {
+    try {
+      return ipcSuccess(license.getUsage(params.feature))
+    } catch (err) {
+      return ipcError(ErrorCode.UnknownError, `Usage query failed: ${err}`)
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.LICENSE.GET_ALL_USAGE, async () => {
+    try {
+      return ipcSuccess(license.getAllUsage())
+    } catch (err) {
+      return ipcError(ErrorCode.UnknownError, `Usage query failed: ${err}`)
+    }
+  })
+
+  ipcMain.handle(IPC_CHANNELS.LICENSE.GET_TIER_COMPARISON, async () => {
+    try {
+      return ipcSuccess(license.getTierComparison())
+    } catch (err) {
+      return ipcError(ErrorCode.UnknownError, `Tier comparison failed: ${err}`)
+    }
+  })
+}