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/repositories/auth_repository.ts

@@ -26,7 +26,7 @@ import { RefreshTokenResponse } from "@/data/dto/auth/refresh_token_response";
 import { RegisterRequest } from "@/data/dto/auth/register_request";
 import { SendCodeRequest } from "@/data/dto/auth/send_code_request";
 import { User } from "@/data/dto/user/user";
-import { Result } from "@/data/result";
+import { Result } from "@/utils/result";
 import { AuthStorage } from "@/data/storage/auth/auth_storage";
 import type { IAuthStorage } from "@/data/storage/auth/iauth_storage";
 import { UserStorage } from "@/data/storage/user/user_storage";
@@ -204,10 +204,10 @@ export class AuthRepository {
    */
   async refreshToken(): Promise<Result<RefreshTokenResponse>> {
     const existing = await this.storage.getRefreshToken();
-    if (existing.kind !== "success" || !existing.value) {
+    if (!existing.success || !existing.data) {
       return Result.err(new Error("No refresh token available"));
     }
-    const refreshToken = existing.value;
+    const refreshToken = existing.data;
     return Result.wrap(async () => {
       const response = await this.api.refreshToken(
         RefreshTokenRequest.from({ refreshToken }),
@@ -228,7 +228,7 @@ export class AuthRepository {
     return Result.wrap(async () => {
       const user = await this.api.getCurrentUser();
       const writeResult = await this.userStorage.setUser(user.toJson());
-      if (writeResult.kind === "failure") {
+      if (!writeResult.success) {
         console.warn(
           "[AuthRepository] failed to cache current user",
           writeResult.error,
@@ -261,21 +261,21 @@ export class AuthRepository {
    */
   private async _saveLoginData(data: LoginResponse): Promise<void> {
     const r1 = await this.storage.setLoginToken(data.token);
-    if (r1.kind === "failure") {
+    if (!r1.success) {
       console.warn("[AuthRepository] setLoginToken failed", r1.error);
     }
     if (data.refreshToken) {
       const r2 = await this.storage.setRefreshToken(data.refreshToken);
-      if (r2.kind === "failure") {
+      if (!r2.success) {
         console.warn("[AuthRepository] setRefreshToken failed", r2.error);
       }
     }
     const r3 = await this.userStorage.setUser(data.user.toJson());
-    if (r3.kind === "failure") {
+    if (!r3.success) {
       console.warn("[AuthRepository] setUser failed", r3.error);
     }
     const r4 = await this.userStorage.setUserId(data.user.id);
-    if (r4.kind === "failure") {
+    if (!r4.success) {
       console.warn("[AuthRepository] setUserId failed", r4.error);
     }
   }

src/data/repositories/chat_repository.ts

@@ -20,7 +20,7 @@ import { ChatHistoryResponse } from "@/data/dto/chat/chat_history_response";
 import { ChatMessage } from "@/data/dto/chat/chat_message";
 import { ChatSendResponse } from "@/data/dto/chat/chat_send_response";
 import { SendMessageRequest } from "@/data/dto/chat/send_message_request";
-import { Result } from "@/data/result";
+import { Result } from "@/utils/result";
 import { LocalChatStorage } from "@/data/storage/chat/local_chat_storage";
 import { LocalMessage } from "@/data/storage/chat/local_message";
 
@@ -72,7 +72,7 @@ export class ChatRepository {
     messages: readonly ChatMessage[],
   ): Promise<Result<void>> {
     const cleared = await this.localStorage.clearAll();
-    if (cleared.kind === "failure") {
+    if (!cleared.success) {
       return Result.err(cleared.error);
     }
     return this._mapLocalStorageResult(
@@ -83,10 +83,10 @@ export class ChatRepository {
   /** 读取所有本地消息，按 dbId 升序。 */
   async getLocalMessages(): Promise<Result<ChatMessage[]>> {
     const result = await this.localStorage.getAllMessages();
-    if (result.kind === "failure") {
+    if (!result.success) {
       return Result.err(result.error);
     }
-    return Result.ok(result.value.map((lm) => this._localToChat(lm)));
+    return Result.ok(result.data.map((lm) => this._localToChat(lm)));
   }
 
   /** 清空本地消息。 */
@@ -126,20 +126,14 @@ export class ChatRepository {
   }
 
   /**
-   * 把 storage 层 `{kind, value/error}` 形态的 `Result<T>` 桥接到仓库层
-   * `{success, data/error}` 形态。错误统一用 `Error` 包装。
+   * 把 storage 层 `Result<T>` 透传：仓库与 storage 现在共享同一全局
+   * `Result<T>`（来自 `@/utils/result`），不需要任何形状转换。
+   * 该方法保留仅为未来万一又出现差异化时方便快速插入适配。
    */
   private async _mapLocalStorageResult<T>(
-    promise: Promise<
-      | { readonly kind: "success"; readonly value: T }
-      | { readonly kind: "failure"; readonly error: unknown }
-    >,
+    promise: Promise<Result<T>>,
   ): Promise<Result<T>> {
-    const r = await promise;
-    if (r.kind === "success") {
-      return Result.ok(r.value);
-    }
-    return Result.err(r.error);
+    return await promise;
   }
 }
 

src/data/repositories/metrics_repository.ts

@@ -10,7 +10,7 @@
 import { MetricsApi, metricsApi } from "@/data/api";
 import { AppEvent } from "@/data/dto/metrics/app_event";
 import { PwaEvent } from "@/data/dto/metrics/pwa_event";
-import { Result } from "@/data/result";
+import { Result } from "@/utils/result";
 
 export class MetricsRepository {
   constructor(private readonly api: MetricsApi) {}

src/data/repositories/user_repository.ts

@@ -14,7 +14,7 @@ import { CreditsHistoryData } from "@/data/dto/user/credits_history_data";
 import { UpdateProfileRequest } from "@/data/dto/user/update_profile_request";
 import { User } from "@/data/dto/user/user";
 import { UserStatsResponse } from "@/data/dto/user/user_stats_response";
-import { Result } from "@/data/result";
+import { Result } from "@/utils/result";
 
 export class UserRepository {
   constructor(private readonly api: UserApi) {}