perf(backend): make some features optionable

Resolve #11064
Resolve #11065

packages/backend/src/models/entities/Meta.ts

@@ -413,6 +413,16 @@ export class Meta {
 	})
 	public enableChartsForFederatedInstances: boolean;
 
+	@Column('boolean', {
+		default: false,
+	})
+	public enableServerMachineStats: boolean;
+
+	@Column('boolean', {
+		default: true,
+	})
+	public enableIdenticonGeneration: boolean;
+
 	@Column('jsonb', {
 		default: { },
 	})