fix(dashboard): resolve import path errors in extensionRuntime.ts

- Fix AppShellBypass import path from '../../../lib/appShellBypass' to '../appShellBypass'
- Correct relative path from src/lib/cms/extensionRuntime.ts to src/lib/appShellBypass.tsx
- Resolves "Module not found" error during Next.js build

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Co-Authored-By: Claude <noreply@anthropic.com>

dashboard/src/lib/cms/extensionRuntime.ts

@@ -5,7 +5,7 @@ import type { CmsExtension, CmsTheme } from './types'
 import { appShellExtension } from './extensions/appShell'
 import { markdownSyncExtension } from './extensions/markdownSync'
 import defaultTheme from './themes/default'
-import { AppShellBypass } from '../lib/appShellBypass'
+import { AppShellBypass } from '../appShellBypass'
 
 const themeRegistry: Record<ThemeName, CmsTheme> = {
   default: defaultTheme,