Add objectRecordCounts query to /metadata endpoint (#18054)

## Summary

- Adds an `objectRecordCounts` query on the `/metadata` GraphQL endpoint
that returns approximate record counts for all objects in the workspace
- Uses PostgreSQL's `pg_class.reltuples` catalog stats — a single
instant query instead of N `COUNT(*)` table scans
- Replaces the previous `CombinedFindManyRecords` approach which hit the
server's 20 root resolver limit and silently showed 0 for all counts on
the settings Data Model page

### Server
- `ObjectRecordCountDTO` — GraphQL type with `objectNamePlural` and
`totalCount`
- `ObjectRecordCountService` — reads `pg_class` catalog for the
workspace schema
- Query added to `ObjectMetadataResolver` with `@MetadataResolver()` +
`NoPermissionGuard`

### Frontend
- `OBJECT_RECORD_COUNTS` query added to
`object-metadata/graphql/queries.ts`
- `useCombinedGetTotalCount` simplified to a zero-argument hook using
the new query
- `SettingsObjectTable` simplified to a single hook call

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.module.ts

@@ -25,6 +25,7 @@ import { ObjectMetadataGraphqlApiExceptionInterceptor } from 'src/engine/metadat
 import { ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
 import { ObjectMetadataResolver } from 'src/engine/metadata-modules/object-metadata/object-metadata.resolver';
 import { ObjectMetadataService } from 'src/engine/metadata-modules/object-metadata/object-metadata.service';
+import { ObjectRecordCountService } from 'src/engine/metadata-modules/object-metadata/object-record-count.service';
 import { ObjectMetadataToolsFactory } from 'src/engine/metadata-modules/object-metadata/tools/object-metadata-tools.factory';
 import { PermissionsModule } from 'src/engine/metadata-modules/permissions/permissions.module';
 import { PermissionsGraphqlApiExceptionFilter } from 'src/engine/metadata-modules/permissions/utils/permissions-graphql-api-exception.filter';
@@ -93,6 +94,7 @@ import { WorkspaceMigrationModule } from 'src/engine/workspace-manager/workspace
   providers: [
     ObjectMetadataService,
     ObjectMetadataResolver,
+    ObjectRecordCountService,
     ObjectMetadataToolsFactory,
   ],
   exports: [ObjectMetadataService, ObjectMetadataToolsFactory],