feat(data-access): add detectedCdn attribute to Site schema

LLMO-3959

Made-with: Cursor

Author: AddyKen-ghost

packages/spacecat-shared-data-access/src/models/site/site.schema.js

@@ -106,6 +106,10 @@ const schema = new SchemaBuilder(Site, SiteCollection)
     type: Object.values(Site.AUTHORING_TYPES),
     required: false,
   })
+  .addAttribute('detectedCdn', {
+    type: 'string',
+    required: false,
+  })
   .addAttribute('gitHubURL', {
     type: 'string',
     postgrestField: 'github_url',