feat: support for FEP fb2a (new-style account metadata)

src/activitypub/index.js

@@ -42,6 +42,9 @@ ActivityPub._constants = Object.freeze({
 	acceptableActorTypes: new Set(['Application', 'Group', 'Organization', 'Person', 'Service']),
 	requiredActorProps: ['inbox', 'outbox'],
 	acceptedProtocols: ['https', ...(process.env.CI === 'true' ? ['http'] : [])],
+	acceptable: {
+		customFields: new Set(['PropertyValue', 'Link', 'Note']),
+	},
 });
 ActivityPub._cache = requestCache;