feat(assets): ZIP에 assets.json 포함 및 메타데이터(integrity 포함) 생성

components/BuilderClientPage.tsx

@@ -7,6 +7,7 @@ import { exportPage } from '@/lib/exporter/html'
 import { AssetManager } from '@/lib/assets/assetManager'
 import { buildZip } from '@/lib/exporter/zip'
 import { buildExtrasForPage } from '@/lib/exporter/extras'
+import { buildAssetsMetadata } from '@/lib/exporter/assets.meta'
 import type { Section } from '@/lib/state/store'
 import { createFormStore, type FormState } from '@/lib/state/formStore'
 import FormBuilderPanel from '@/components/FormBuilderPanel'
@@ -237,7 +238,11 @@ export default function BuilderClientPage() {
       const disallowLines = lines.map((l) => (l.startsWith('Disallow:') ? l : `Disallow: ${l}`))
       return `User-agent: *\n${disallowLines.join('\n')}`
     })()
-    const extras = buildExtrasForPage(valid, { robotsText: robotsTextOverride, manifest: manifestOverride })
+    const baseExtras = buildExtrasForPage(valid, { robotsText: robotsTextOverride, manifest: manifestOverride })
+    const extras: Record<string, Uint8Array> = {
+      ...baseExtras,
+      ...(am ? { 'assets.json': buildAssetsMetadata(am) } : {}),
+    }
     const zipBytes = await buildZip({ html: exported.html, css: exported.css, js: exported.js, assets, extras })
     download('landing.zip', zipBytes)
   }, [pageData, am, manifestName, manifestShortName, manifestStartUrl, manifestDisplay, manifestThemeColor, robotsDisallow])