feat(gpu-service): align instance-type/flavor contract with status.detail API

- spec keeps definition fields only; observed hardware read from status.detail
- sliceable derived from slicedDetail (logical count / physical profiles)
- flat snapshot format isolated in instance-description for back-compat
- drop flavor.spec.sliceable; onceMaxRequest realigned (no ram/localStorage)
- lock compute ratio to memory ratio when coresPercentageOvercommit is false
- sliced mode submits whole cores / Gi; displayName-first type labels

src/pages/gpu-service/instances/utils/instance-description.ts

@@ -1,5 +1,25 @@
 import _ from 'lodash';
-import { InstanceTypeItem } from '../config/types';
+import { isSliceableDetail } from '../config';
+import { InstanceTypeItem, InstanceTypeSnapshotSpec } from '../config/types';
+
+// Build the flat snapshot spec from a live (API-shaped) instance type:
+// definition fields from spec, observed hardware from status.detail, plus the
+// derived `sliceable`. This flat shape is the UI document format persisted in
+// the instance's `description` (older instances already carry it flat) and
+// doubles as the display model of the type card / metadata section.
+export const buildInstanceTypeSnapshotSpec = (
+  instanceType: InstanceTypeItem
+): InstanceTypeSnapshotSpec => {
+  const detail = instanceType.status?.detail;
+  return {
+    ...instanceType.spec,
+    ..._.pick(detail, ['manufacturer', 'product', 'family', 'memory']),
+    sliceable: isSliceableDetail(detail?.slicedDetail),
+    // Accelerator CPU identity only — the full CPU descriptor is too bulky to
+    // persist and the UI only shows who made it.
+    cpu: _.pick(detail?.cpu, ['manufacturer', 'product', 'family'])
+  };
+};
 
 // Serialize the chosen instance type into the instance's `description` field —
 // a persisted spec snapshot the form reads back to render the type card and
@@ -10,9 +30,6 @@ export const saveInstanceDataInDescription = (
 ): string => {
   return JSON.stringify({
     name: instanceType.name,
-    spec: {
-      ..._.omit(instanceType.spec, ['cache', 'cpu']),
-      cpu: _.pick(instanceType.spec?.cpu, ['manufacturer', 'product', 'family'])
-    }
+    spec: buildInstanceTypeSnapshotSpec(instanceType)
   });
 };