fix(auth): replace hardcoded platform name with dynamic platform detection

src/data/repositories/auth_repository.ts

@@ -16,7 +16,7 @@ import {
   SendCodeRequest,
 } from "@/data/dto/auth";
 import { User } from "@/data/dto/user";
-import { AppEnvUtil, Result, Logger } from "@/utils";
+import { AppEnvUtil, PlatformDetector, Result, Logger } from "@/utils";
 import type { IAuthRepository } from "@/data/repositories/interfaces";
 import { AuthStorage, type IAuthStorage } from "@/data/storage/auth";
 import { UserStorage, type IUserStorage } from "@/data/storage/user";
@@ -24,8 +24,6 @@ import { createLazySingleton } from "./lazy_singleton";
 
 const log = new Logger("DataRepositoriesAuthRepository");
 
-/** 硬编码平台名，对齐 Dart `PlatformUtil.platformName.toLowerCase()`（Web 平台）。 */
-const WEB_PLATFORM = "web";
 const TEST_ACCOUNT_FLAG = "isTestAccount";
 
 export class AuthRepository implements IAuthRepository {
@@ -54,7 +52,7 @@ export class AuthRepository implements IAuthRepository {
             username: input.username,
             email: input.email,
             password: input.password,
-            platform: WEB_PLATFORM,
+            platform: getAuthPlatform(),
             guestId: input.guestId ?? "",
           }),
         ),
@@ -76,7 +74,7 @@ export class AuthRepository implements IAuthRepository {
             email: input.email ?? "",
             username: input.username ?? "",
             password: input.password,
-            platform: WEB_PLATFORM,
+            platform: getAuthPlatform(),
             guestId: input.guestId ?? "",
           }),
         ),
@@ -157,7 +155,7 @@ export class AuthRepository implements IAuthRepository {
         GoogleLoginRequest.from(
           withTestAccountFlag({
             idToken: input.idToken,
-            platform: WEB_PLATFORM,
+            platform: getAuthPlatform(),
             guestId: input.guestId ?? "",
           }),
         ),
@@ -175,7 +173,7 @@ export class AuthRepository implements IAuthRepository {
         FacebookLoginRequest.from(
           withTestAccountFlag({
             accessToken: input.accessToken,
-            platform: WEB_PLATFORM,
+            platform: getAuthPlatform(),
             guestId: input.guestId ?? "",
           }),
         ),
@@ -211,7 +209,7 @@ export class AuthRepository implements IAuthRepository {
         AppleLoginRequest.from(
           withTestAccountFlag({
             identityToken,
-            platform: WEB_PLATFORM,
+            platform: getAuthPlatform(),
           }),
         ),
       ),
@@ -319,3 +317,7 @@ function withTestAccountFlag<T extends Record<string, unknown>>(
     [TEST_ACCOUNT_FLAG]: !AppEnvUtil.isProduction(),
   };
 }
+
+function getAuthPlatform(): string {
+  return PlatformDetector.getPlatform();
+}