refactor(backends): rename organization_id to owner_principal_id

Aligns the InferenceBackend ownership column with the principal-based
ownership model used elsewhere (clusters, model_routes). NULL identifies
platform-curated rows shared across orgs; a populated value identifies
an org-scoped override or custom backend.

src/pages/backends/components/backend-card.tsx

@@ -252,7 +252,7 @@ const BackendCard: React.FC<BackendCardProps> = ({
     const ownerTag = (
       <PluginExtraFields
         name="BackendOwnerTag"
-        context={{ organizationId: data.organization_id }}
+        context={{ ownerPrincipalId: data.owner_principal_id }}
       />
     );
     if (!source) {

src/pages/backends/config/index.ts

@@ -113,7 +113,8 @@ export const backendActions = [
     // An org-scoped override of a built-in IS deletable — deleting
     // the override is how the user reverts to the Platform row.
     // Plain custom backends are always deletable.
-    show: (record: any) => !record.is_built_in || record.organization_id != null
+    show: (record: any) =>
+      !record.is_built_in || record.owner_principal_id != null
   }
 ];
 

src/pages/backends/config/types.ts

@@ -40,4 +40,7 @@ export interface ListItem extends FormData {
   recommend_models: string[];
   built_in_version_configs?: Record<string, VersionConfigs>;
   framework_index_map?: Record<string, string[]>;
+  // Backend owner — NULL for platform-curated rows shared across orgs;
+  // populated for org-scoped overrides / custom backends.
+  owner_principal_id?: number | null;
 }

src/pages/backends/index.tsx

@@ -173,7 +173,7 @@ const BackendList = () => {
       // gets a real DELETE.
       const isPlatformCommunity =
         item.data.backend_source === BackendSourceValueMap.COMMUNITY &&
-        item.data.organization_id == null;
+        item.data.owner_principal_id == null;
       if (isPlatformCommunity) {
         modalRef.current?.show({
           content: 'backends.title',