feat: distinguish same-name GPU service resources across users

Resource names are unique per owning principal, so different users
can legally create same-name GPU instances, templates, SSH public
keys, storage volumes and storage types — but the admin's
cross-tenant lists and the instance-create template picker rendered
them indistinguishably.

- Group the template picker by owning scope: Your Templates, Global
  Templates, then — admin cross-tenant view only — one group per
  owner. A single group renders flat without headers. A plugin can
  take over grouping via hooks.useTemplateOwnerGroups when its
  principal model scopes templates beyond USER owners; a plugin
  without the hook keeps the flat list.
- Add an admin-only Creator column to the Instances, SSH Public
  Keys, Storage and Storage Types tables, sitting right before
  Created (mirroring the API Keys page convention). Resolves
  creator_id to a username via the user directory, falling back to
  owner_principal_id for legacy rows — a personal-scope row's
  creator IS its owner.
- Tag template cards with their owner scope (Global / username) for
  admins.

The Creator column and the card tag defer to a plugin that registers
the page's list columns / the OwnerScopeTag slot. Requires the
gpustack server change that records creator_id on templates, SSH
public keys and storage types.

src/pages/gpu-service/templates/components/template-card.tsx

@@ -14,6 +14,7 @@ import tensorflowkLogo from '@/assets/logo/tensorflow.svg';
 import ubuntuLogo from '@/assets/logo/ubuntu_logo.png';
 import vllmLogo from '@/assets/logo/vllm.png';
 import PluginExtraFields from '@/components/plugin-extra-fields';
+import OwnerTag from '@/pages/gpu-service/components/owner-tag';
 import {
   GPUsConfigs,
   manfacturerValueMap
@@ -266,6 +267,7 @@ const TemplateCardItem: React.FC<TemplateCardProps> = ({ data, onSelect }) => {
             name="OwnerScopeTag"
             context={{ ownerPrincipalId: data.owner_principal_id }}
           />
+          <OwnerTag ownerId={data.owner_principal_id} />
         </CardName>
         <InfoItem>
           <span>

src/pages/gpu-service/templates/config/types.ts

@@ -40,6 +40,7 @@ export interface ListItem extends FormData {
   // the `OwnerScopeTag` slot on the card so the owner is visible at a
   // glance. Optional on the wire — absent in single-owner builds.
   owner_principal_id?: number | null;
+  creator_id?: number | null;
   created_at?: string;
   updated_at?: string;
 }