Adds the read API surface that the global Containers view (and
the per-workload container panel on project/stack/site detail
pages) consume.
- GET /api/workloads (?kind=) → workload list
- GET /api/workloads/{id} → single workload
- GET /api/workloads/{id}/containers → workload's containers
- PATCH /api/workloads/{id}/app → assign/clear app_id (admin)
- GET /api/containers (?workload_id=&kind=&state=&app_id=)
→ global index, decorated
with workload + app name
so the table renders
without N+1 fetches
- GET /api/containers/{id} → single container row
- GET /api/apps → list
- GET /api/apps/{id} → single
- POST /api/apps → create (admin)
- PUT /api/apps/{id} → update (admin)
- DELETE /api/apps/{id} → delete (admin) — clears
app_id on owning workloads
but leaves them assigned-to-none
Mutations on projects/stacks/sites still go through the existing
kind-specific endpoints; the new surface is read-only at the
workload layer.
