feat(admin,api): restrict community creation on self-hosted (#3055)

packages/schema/src/domains/instance/InstanceSchemas.ts

@@ -160,6 +160,11 @@ export const InstanceCommunitySchema = z
 		direct_messages_disabled: z
 			.boolean()
 			.describe('Whether direct messages and friend requests are disabled instance-wide'),
+		guild_create_access: z
+			.boolean()
+			.describe(
+				'Whether every account can create communities. When false, only admins and accounts granted the feature_guild_create limit can',
+			),
 	})
 	.describe('Community topology and direct-message policy for this instance');
 export type InstanceCommunity = z.infer<typeof InstanceCommunitySchema>;