feat(server): add public marketplace resolver for vetted app catalog (#22647)

## What

Adds a public GraphQL resolver so unauthenticated clients (the public
website) can read the listed/vetted marketplace catalog without a
workspace token.

- `MarketplacePublicResolver` (metadata schema) exposes two public
queries guarded by `PublicEndpointGuard` + `NoPermissionGuard`:
  - `publicMarketplaceApps`
  - `publicMarketplaceAppDetail(universalIdentifier)`
  
Both delegate to the existing `MarketplaceQueryService` (no new logic,
no new REST routing). The existing workspace-guarded
`findManyMarketplaceApps` / `findMarketplaceAppDetail` queries are
untouched.
- Adds a shared `ApplicationCategory` type in `twenty-shared` (known
values plus `string` for backward compatibility) used to type
`ApplicationManifest.category`. A warning is logged server-side when an
app declares a category outside the known set.

## Why

This is the backend half of the public apps marketplace on the website.
Splitting it out so the server-side catalog exposure can be reviewed
independently from the website UI.

## Follow-up

The website PR (the `/apps` marketplace UI) consumes
`publicMarketplaceApps` and should merge after this one.

---
_Generated by [Claude
Code](https://claude.ai/code/session_01GBfegArtJcoiTLSsnWPH8R)_

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---------

Co-authored-by: martmull <martin@twenty.com>

packages/twenty-server/src/engine/core-entity-cache/types/core-entity-cache-key.type.ts

@@ -1,3 +1,4 @@
+import { type MarketplaceAppDTO } from 'src/engine/core-modules/application/application-marketplace/dtos/marketplace-app.dto';
 import { type FlatUserWorkspace } from 'src/engine/core-modules/user-workspace/types/flat-user-workspace.type';
 import { type FlatUser } from 'src/engine/core-modules/user/types/flat-user.type';
 import { type FlatWorkspace } from 'src/engine/core-modules/workspace/types/flat-workspace.type';
@@ -7,6 +8,7 @@ export type CoreEntityCacheDataMap = {
   user: FlatUser;
   userWorkspaceEntity: FlatUserWorkspace;
   signingKeyPublicKey: string;
+  marketplaceCatalog: Record<string, MarketplaceAppDTO>;
 };
 
 export type CoreEntityCacheKeyName = keyof CoreEntityCacheDataMap;
@@ -16,4 +18,5 @@ export const CORE_ENTITY_CACHE_KEYS: Record<CoreEntityCacheKeyName, string> = {
   user: 'user',
   userWorkspaceEntity: 'user-workspace',
   signingKeyPublicKey: 'signing-key-public-key',
+  marketplaceCatalog: 'marketplace-catalog',
 };