Opening an org-scoped deployment in the Playground pre-selected the bare
model name (e.g. `qwen3-0.6b`), which never matched the org-namespaced
option the `/v1/models` dropdown actually lists (`org1/qwen3-0.6b`), so
the selection showed an unmatched value.
Resolve the owning org from the route row's `owner_principal_id` (falling
back to the org the caller is currently acting under for the admin "All"
view) and reconstruct the same `{org}/{name}` id the server reports. The
platform org carries no prefix, matching the server's behaviour.
- user.ts: add `getOrgById`/`getCurrentOrg` that scan both org caches
(`organizationList` + admin-only `allOrganizations`) with string-
normalised id comparison; `getOrgNameById` is now a thin wrapper.
Helpers accept `undefined` so optional row fields type-check.
- use-open-playground: build the prefix from the resolved org record,
keying the skip-prefix decision off `is_platform`.
- RouteItem: declare the `owner_principal_id` the list API returns.
- RouteTargetFormItem: drop the duplicate `overridden_model_name`
declaration that TS flagged as a duplicate identifier.
