fix(api-keys): let platform admin create a non-tenant-pinned API key

The CreateOrgScopeField slot only renders a "Global" choice when the
host form passes ``allowGlobal: true``. Without it, an admin in the
"All Orgs" view sees only Personal + every org in the dropdown — and
the form's submit injects an ``X-Organization-Id`` header for every
choice, pinning the new key to a tenant. The matching backend change
(api_keys.owner_principal_id nullable) only kicks in when no header
is sent.

Pass ``allowGlobal: true`` (default-selects Global for admin) plus
``globalLabelId: 'scope.global'`` so the dropdown option reads as
plain "Global" — matching the existing tag / column labels for the
same concept elsewhere in the UI, instead of the longer
inference-backend "shared with all organizations" copy.

Relax the ListItem type so ``owner_principal_id`` may be ``null`` —
the OrganizationCell / OwnerScopeTag renderers already render the
"Global" placeholder for null/undefined; the type was the only thing
still claiming the column was always present.

src/pages/api-keys/components/add-apikey-modal/form.tsx

@@ -47,7 +47,12 @@ const APIKeyForm: React.FC<{
 
       <PluginExtraFields
         name="CreateOrgScopeField"
-        context={{ action, allowPersonal: true }}
+        context={{
+          action,
+          allowPersonal: true,
+          allowGlobal: true,
+          globalLabelId: 'scope.global'
+        }}
       />
 
       <Form.Item<FormData>

src/pages/api-keys/config/types.ts

@@ -6,10 +6,10 @@ export interface ListItem {
   masked_value?: string;
   user_id?: number;
   user_name?: string;
-  // The owning principal — an Org, or a USER principal when the key
-  // was created in someone's Personal Org. Read by the enterprise
-  // plugin's Organization column in the admin All-org view.
-  owner_principal_id?: number;
+  // The owning principal — an Org, or a USER principal for a
+  // personal-scope key, or NULL for an admin "All" mode key (no
+  // tenant pinning).
+  owner_principal_id?: number | null;
   created_at: string;
   updated_at: string;
   expires_at: string;