feat(redesign): MockWindow 라이트 목업 시스템(프레임+6스크린+레지스트리)

파티클 대체 craft 핵심. 실데이터 0, --jsm-* 라이트 토큰만.
dashboard/feed/match/commerce/site/booking 6종 + 레지스트리.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A2N6SziVSPfavx1j5rAs52

app/components/mock/registry.ts

@@ -0,0 +1,30 @@
+// 목업 스크린 레지스트리 — showcase 슬롯의 mock 키를 컴포넌트로 해석.
+import type { ComponentType } from 'react';
+
+import {
+  DashboardMock,
+  FeedMock,
+  MatchMock,
+  CommerceMock,
+  SiteMock,
+  BookingMock,
+} from './screens';
+
+export type MockKey =
+  | 'dashboard'
+  | 'feed'
+  | 'match'
+  | 'commerce'
+  | 'site'
+  | 'booking';
+
+export const MOCK_REGISTRY: Record<MockKey, ComponentType> = {
+  dashboard: DashboardMock,
+  feed: FeedMock,
+  match: MatchMock,
+  commerce: CommerceMock,
+  site: SiteMock,
+  booking: BookingMock,
+};
+
+export const MOCK_KEYS = Object.keys(MOCK_REGISTRY) as MockKey[];