refactor(storage): rename dsh-domain to dsh-storage-domain

The bare 'domain' name was too generic for a published package. The
directory moves to packages/storage/storage-domain, the package becomes
@deepseek-ai/dsh-storage-domain, and the plugin/invariant names follow;
the ctx surface (ctx.storage.domain), the domain/changed event, and all
runtime behavior are unchanged. References, catalogs, graphs, and the
bilingual design note move together.

scripts/gen-doc-graphs.ts

@@ -140,7 +140,7 @@ const SERVICE_ROLES: ServiceRole[] = [
     title: 'Non-session storage hub',
     mode: 'seam',
     implementations: ['storage-json', 'storage-sqlite'],
-    consumers: ['domain', 'workspace'],
+    consumers: ['storage-domain', 'workspace'],
     note: 'Backends register side by side under names; data forms (domain first) mount on the hub and translate typed operations into opaque KV-unit primitives.',
   },
   {