refactor(data): move Result utility to utils and simplify API

Relocate the Result type from `@/data/result` to `@/utils/result` and
replace the discriminated-union API (`kind`/`value`) with a simpler
boolean-based API (`success`/`data`) across all repositories and
storage classes for improved readability and consistency.

src/data/storage/index.ts

@@ -4,7 +4,7 @@
 
 export * from "./auth_storage";
 export * from "./local_storage";
-export * from "./result";
+export * from "@/utils/result";
 export * from "./storage_keys";
 export * from "./app/app_storage";
 export * from "./auth/auth_storage";