fix(clusters): scope cluster pickers to the owning org

Cluster pickers listed every visible cluster, which includes clusters
shared with all authenticated users (e.g. the default org's "shared with
everyone" clusters). A member of a custom org could then pick another
org's cluster for a model deployment or a new worker.

Request only the current org's own clusters (mine=true) for:
- the model deploy picker (models page),
- the deploy-from-model-file picker (model files page), and
- the add-worker picker.

These resources are owner-scoped on the backend, so the model list and
the worker table (including its cluster-name column) only reference
own-org clusters. The add-model-file worker cascader is already own-org
via the owner-scoped worker list. Platform admin in the "All" view
bypasses mine and is scoped instead by the org picker.

src/pages/resources/components/workers.tsx

@@ -103,8 +103,14 @@ const Workers: React.FC<WorkersProps> = ({ clusterId, source }) => {
 
   const getClusterList = async () => {
     try {
+      // Own-org clusters only (mine=true). A worker can only join a cluster
+      // its org owns, so another org's cluster (e.g. the Default org's
+      // "shared with everyone" clusters) must not be offered in the picker.
+      // The worker list is owner-scoped too, so this list also covers every
+      // cluster the table's name column can reference.
       const params = {
-        page: -1
+        page: -1,
+        mine: true
       };
       const items = await fetchClusterList(params);
       const clusterMap = items?.reduce(