app: remove deprecated `key`/`name` getters from AppManifest transform

In `packages/modules/app/src/AppClient.ts`, `ApplicationSchema`'s `transform` adds backwards-compatible `key` and `name` getters (aliasing `appKey`/`displayName`) marked as deprecated TODOs. Remove these once consumers have migrated to the non-deprecated properties.

```ts
// TODO: remove deprecated appKey
get key() {
return props.appKey;
},
// TODO: remove deprecated name
get name() {
return props.displayName;
},
```

Open packages/modules/app/src/AppClient.ts and inspect ApplicationSchema's transform, then search the repository for consumers of the deprecated key and name getters. Done means the backwards-compatible getters are removed while appKey and displayName remain available; run the relevant package checks if identified in the repository.

Written by the indexing model from the issue text.