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/auth/auth_storage.ts

@@ -15,7 +15,7 @@
  */
 
 import { LocalStorage } from "../local_storage";
-import { Result, type Result as ResultT } from "../result";
+import { Result, type Result as ResultT } from "@/utils/result";
 import { StorageKeys } from "../storage_keys";
 import type { IAuthStorage } from "./iauth_storage";
 
@@ -47,8 +47,8 @@ export class AuthStorage implements IAuthStorage {
   }
   async hasLoginToken(): Promise<ResultT<boolean>> {
     const r = await this.getLoginToken();
-    if (r.kind === "failure") return Result.failure(r.error);
-    return Result.success(r.value !== null && r.value.length > 0);
+    if (!r.success) return Result.err(r.error);
+    return Result.ok(r.data !== null && r.data.length > 0);
   }
   clearLoginToken(): Promise<ResultT<void>> {
     return this.ls.remove(StorageKeys.loginToken);
@@ -64,8 +64,8 @@ export class AuthStorage implements IAuthStorage {
   }
   async hasGuestToken(): Promise<ResultT<boolean>> {
     const r = await this.getGuestToken();
-    if (r.kind === "failure") return Result.failure(r.error);
-    return Result.success(r.value !== null && r.value.length > 0);
+    if (!r.success) return Result.err(r.error);
+    return Result.ok(r.data !== null && r.data.length > 0);
   }
   clearGuestToken(): Promise<ResultT<void>> {
     return this.ls.remove(StorageKeys.guestToken);
@@ -107,9 +107,9 @@ export class AuthStorage implements IAuthStorage {
 
   async clearAuthData(): Promise<ResultT<void>> {
     const r1 = await this.clearLoginToken();
-    if (r1.kind === "failure") return r1;
+    if (!r1.success) return r1;
     const r2 = await this.clearGuestToken();
-    if (r2.kind === "failure") return r2;
+    if (!r2.success) return r2;
     return this.clearRefreshToken();
   }
 }

src/data/storage/auth/iauth_storage.ts

@@ -9,7 +9,7 @@
  *   - 所有方法返回 `Promise<Result<T>>`，与 Dart `Future<Result<T>>` 对齐
  */
 
-import type { Result } from "../result";
+import type { Result } from "@/utils/result";
 
 export interface IAuthStorage {
   getLoginToken(): Promise<Result<string | null>>;