fix: source owner_principal_id from current organization

OwnerPrincipalIdField was reading currentClusterAtom, which no callers
ever wrote — so every form submission ended up with
owner_principal_id=null and the backend rejected non-admins with
"Only platform admin can create global ...". Pin the field to
currentOrganizationId instead (the Org the caller is acting under).
Cluster ownership is the wrong source: a cluster_access grant lets one
Org schedule on another Org's cluster, but the new resource is still
owned by the caller's Org, and the backend enforces
owner_principal_id == ctx.current_principal_id.

Also drops the dead currentClusterAtom.

src/atoms/gpuservice.ts

@@ -1,6 +0,0 @@
-import { ClusterListItem } from '@/pages/cluster-management/config/types';
-import { atom } from 'jotai';
-
-export const currentClusterAtom = atom<
-  (Partial<ClusterListItem> & { label?: string; value?: number }) | null
->(null);

src/atoms/user.ts

@@ -3,6 +3,15 @@ import { atomWithStorage } from 'jotai/utils';
 
 export const userAtom = atomWithStorage<any>('userInfo', null);
 
+// Backs the `currentOrganizationId` localStorage key. Stays null in
+// builds with no Org context (single-tenant), and is shared with any
+// extension that persists the same key so both sides stay in sync
+// without one side having to import from the other.
+export const currentOrganizationIdAtom = atomWithStorage<number | null>(
+  'currentOrganizationId',
+  null
+);
+
 export const GPUStackVersionAtom = atom<{
   version: string;
   git_commit: string;

src/pages/_components/owner-principal-id-field.tsx

@@ -1,4 +1,4 @@
-import { currentClusterAtom } from '@/atoms/gpuservice';
+import { currentOrganizationIdAtom } from '@/atoms/user';
 import { Input as CInput } from '@gpustack/core-ui';
 import { Form } from 'antd';
 import type { NamePath } from 'antd/es/form/interface';
@@ -9,18 +9,22 @@ interface OwnerPrincipalIdFieldProps {
   name?: NamePath;
 }
 
+// Pins `owner_principal_id` to the Org the caller is currently acting
+// under. Cluster ownership is irrelevant here: cluster_access grants
+// let one Org schedule on another Org's cluster, but the resource the
+// caller creates still belongs to *their* Org, and the backend enforces
+// `owner_principal_id == ctx.current_principal_id`.
 const OwnerPrincipalIdField: React.FC<OwnerPrincipalIdFieldProps> = ({
   name = 'owner_principal_id'
 }) => {
-  const currentCluster = useAtomValue(currentClusterAtom);
-  const ownerPrincipalId = currentCluster?.owner_principal_id;
+  const currentOrgId = useAtomValue(currentOrganizationIdAtom);
   const form = Form.useFormInstance();
 
   useEffect(() => {
-    if (ownerPrincipalId != null) {
-      form.setFieldValue(name, ownerPrincipalId);
+    if (currentOrgId != null) {
+      form.setFieldValue(name, currentOrgId);
     }
-  }, [ownerPrincipalId, name, form]);
+  }, [currentOrgId, name, form]);
 
   return (
     <Form.Item name={name} hidden>