refactor: move marketplace protocol from kernel/ to cloud/

Marketplace is a cloud SaaS service, not part of the local kernel runtime.
Moved marketplace.zod.ts and marketplace.test.ts to cloud/ directory,
added Cloud namespace export to root index.ts.

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/spec/src/cloud/index.ts

@@ -0,0 +1,11 @@
+// Copyright (c) 2025 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * Cloud Protocol
+ * 
+ * Cloud-specific protocols for the ObjectStack SaaS platform.
+ * These schemas define the contract for cloud services like:
+ * - Marketplace (listing, publishing, review, search, install)
+ * - Future: Composer, Space, Hub Federation
+ */
+export * from './marketplace.zod';

…ages/spec/src/kernel/marketplace.test.ts …kages/spec/src/cloud/marketplace.test.tspackages/spec/src/kernel/marketplace.test.ts renamed to packages/spec/src/cloud/marketplace.test.ts packages/spec/src/kernel/marketplace.test.ts renamed to packages/spec/src/cloud/marketplace.test.ts

@@ -50,6 +50,7 @@ export * as Security from './security';
 export * as UI from './ui';
 export * as System from './system';
 export * as Kernel from './kernel';
+export * as Cloud from './cloud';
 export * as QA from './qa';
 export * as Identity from './identity';
 export * as Hub from './hub';

…kages/spec/src/kernel/marketplace.zod.ts …ckages/spec/src/cloud/marketplace.zod.tspackages/spec/src/kernel/marketplace.zod.ts renamed to packages/spec/src/cloud/marketplace.zod.ts packages/spec/src/kernel/marketplace.zod.ts renamed to packages/spec/src/cloud/marketplace.zod.ts

@@ -6,7 +6,6 @@ export * from './dev-plugin.zod';
 export * from './events.zod';
 export * from './feature.zod';
 export * from './manifest.zod';
-export * from './marketplace.zod';
 export * from './metadata-customization.zod';
 export * from './metadata-loader.zod';
 export * from './package-registry.zod';