feat: add removable reference feature vertical slice

src/application/ports/in/application-api.ts

@@ -47,4 +47,8 @@ export type ApplicationApi = Readonly<{
       | Readonly<{ action: "support"; reason: string }>
     >;
   }>;
+  features: Readonly<{
+    has(featureId: string): boolean;
+    get(featureId: string): unknown;
+  }>;
 }>;