feat(web): prepare the fluxer.com domain migration (#2952)

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

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
+import {DomainMigrationDiscoveryResponse} from '@fluxer/schema/src/domains/admin/DomainMigrationSchemas';
 import {SsoStatusResponse} from '@fluxer/schema/src/domains/auth/AuthSchemas';
 import {createNamedStringLiteralUnion} from '@fluxer/schema/src/primitives/SchemaPrimitives';
 import {z} from 'zod';
@@ -187,6 +188,9 @@ export const WellKnownFluxerResponse = z.object({
 	limits: LimitConfigResponse.describe('Limit configuration with rules and trait definitions'),
 	push: InstancePushSchema,
 	app_public: InstanceAppPublicSchema.describe('Public application configuration for client-side features'),
+	domain_migration: DomainMigrationDiscoveryResponse.optional().describe(
+		'Web domain migration switch and anonymous rollout, only acted on by official instance clients',
+	),
 });
 
 export type WellKnownFluxerResponse = z.infer<typeof WellKnownFluxerResponse>;