diff --git a/src/core/net/interceptor/auth_refresh_interceptor.ts b/src/core/net/interceptor/auth_refresh_interceptor.ts
index 72a7a025..bf0e5fa1 100644
--- a/src/core/net/interceptor/auth_refresh_interceptor.ts
+++ b/src/core/net/interceptor/auth_refresh_interceptor.ts
@@ -8,7 +8,7 @@ import type { FetchHook } from "ofetch";
 import { ApiPath } from "../../../data/services/api/api_path";
 import { ApiError, ErrorCode } from "../../../data/services/api/api_result";
 import { AuthStorage } from "@/data/storage/auth/auth_storage";
-import { deviceIdentifier, Result } from "@/utils";
+import { AppEnvUtil, deviceIdentifier, Result } from "@/utils";
 
 /**
  * 不需要 auth token 刷新的路径
@@ -105,7 +105,7 @@ async function refreshGuestToken(baseUrl: string): Promise<void> {
   const response = await fetch(`${baseUrl}${ApiPath.guestLogin}`, {
     method: "POST",
     headers: { "Content-Type": "application/json" },
-    body: JSON.stringify({ deviceId }),
+    body: JSON.stringify(withTestAccountFlag({ deviceId })),
   });
 
   if (!response.ok) {
@@ -125,6 +125,12 @@ async function refreshGuestToken(baseUrl: string): Promise<void> {
   }
 }
 
+function withTestAccountFlag<T extends Record<string, unknown>>(
+  payload: T,
+): T & { isTestAccount: boolean } {
+  return { ...payload, isTestAccount: !AppEnvUtil.isProduction() };
+}
+
 /**
  * 401 → 刷新 token 并重试
  */
diff --git a/src/data/dto/auth/apple_login_request.ts b/src/data/dto/auth/apple_login_request.ts
index 218a38ad..7416506e 100644
--- a/src/data/dto/auth/apple_login_request.ts
+++ b/src/data/dto/auth/apple_login_request.ts
@@ -10,6 +10,7 @@ import {
 export class AppleLoginRequest {
   declare readonly identityToken: string;
   declare readonly platform: string;
+  declare readonly isTestAccount: boolean;
 
   private constructor(input: AppleLoginRequestInput) {
     const data = AppleLoginRequestSchema.parse(input);
diff --git a/src/data/dto/auth/facebook_login_request.ts b/src/data/dto/auth/facebook_login_request.ts
index 2a96eb59..fdff17ad 100644
--- a/src/data/dto/auth/facebook_login_request.ts
+++ b/src/data/dto/auth/facebook_login_request.ts
@@ -11,6 +11,7 @@ export class FacebookLoginRequest {
   declare readonly accessToken: string;
   declare readonly platform: string;
   declare readonly guestId: string;
+  declare readonly isTestAccount: boolean;
 
   private constructor(input: FacebookLoginRequestInput) {
     const data = FacebookLoginRequestSchema.parse(input);
diff --git a/src/data/dto/auth/fb_id_login_request.ts b/src/data/dto/auth/fb_id_login_request.ts
index f0f26430..82642114 100644
--- a/src/data/dto/auth/fb_id_login_request.ts
+++ b/src/data/dto/auth/fb_id_login_request.ts
@@ -10,6 +10,7 @@ import {
 export class FbIdLoginRequest {
   declare readonly fbId: string;
   declare readonly avatarUrl: string;
+  declare readonly isTestAccount: boolean;
 
   private constructor(input: FbIdLoginRequestInput) {
     const data = FbIdLoginRequestSchema.parse(input);
diff --git a/src/data/dto/auth/google_login_request.ts b/src/data/dto/auth/google_login_request.ts
index 0dbcba5b..964f72a3 100644
--- a/src/data/dto/auth/google_login_request.ts
+++ b/src/data/dto/auth/google_login_request.ts
@@ -11,6 +11,7 @@ export class GoogleLoginRequest {
   declare readonly idToken: string;
   declare readonly platform: string;
   declare readonly guestId: string;
+  declare readonly isTestAccount: boolean;
 
   private constructor(input: GoogleLoginRequestInput) {
     const data = GoogleLoginRequestSchema.parse(input);
diff --git a/src/data/dto/auth/guest_login_request.ts b/src/data/dto/auth/guest_login_request.ts
index d01274cd..28d98341 100644
--- a/src/data/dto/auth/guest_login_request.ts
+++ b/src/data/dto/auth/guest_login_request.ts
@@ -9,6 +9,7 @@ import {
 
 export class GuestLoginRequest {
   declare readonly deviceId: string;
+  declare readonly isTestAccount: boolean;
 
   private constructor(input: GuestLoginRequestInput) {
     const data = GuestLoginRequestSchema.parse(input);
diff --git a/src/data/dto/auth/login_request.ts b/src/data/dto/auth/login_request.ts
index 4c69cba4..a5f84a74 100644
--- a/src/data/dto/auth/login_request.ts
+++ b/src/data/dto/auth/login_request.ts
@@ -13,6 +13,7 @@ export class LoginRequest {
   declare readonly password: string;
   declare readonly platform: string;
   declare readonly guestId: string;
+  declare readonly isTestAccount: boolean;
 
   private constructor(input: LoginRequestInput) {
     const data = LoginRequestSchema.parse(input);
diff --git a/src/data/dto/auth/register_request.ts b/src/data/dto/auth/register_request.ts
index 856ed5a3..dc8c4236 100644
--- a/src/data/dto/auth/register_request.ts
+++ b/src/data/dto/auth/register_request.ts
@@ -13,6 +13,7 @@ export class RegisterRequest {
   declare readonly password: string;
   declare readonly platform: string;
   declare readonly guestId: string;
+  declare readonly isTestAccount: boolean;
 
   private constructor(input: RegisterRequestInput) {
     const data = RegisterRequestSchema.parse(input);
diff --git a/src/data/repositories/auth_repository.ts b/src/data/repositories/auth_repository.ts
index 409604bb..a228e10d 100644
--- a/src/data/repositories/auth_repository.ts
+++ b/src/data/repositories/auth_repository.ts
@@ -28,7 +28,7 @@ import {
   SendCodeRequest,
 } from "@/data/dto/auth";
 import { User } from "@/data/dto/user";
-import { Result, Logger } from "@/utils";
+import { AppEnvUtil, 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";
@@ -37,6 +37,7 @@ 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 {
   constructor(
@@ -59,13 +60,15 @@ export class AuthRepository implements IAuthRepository {
   }): Promise<Result<void>> {
     return Result.wrap(async () => {
       await this.api.register(
-        RegisterRequest.from({
-          username: input.username,
-          email: input.email,
-          password: input.password,
-          platform: WEB_PLATFORM,
-          guestId: input.guestId ?? "",
-        }),
+        RegisterRequest.from(
+          withTestAccountFlag({
+            username: input.username,
+            email: input.email,
+            password: input.password,
+            platform: WEB_PLATFORM,
+            guestId: input.guestId ?? "",
+          }),
+        ),
       );
     });
   }
@@ -79,13 +82,15 @@ export class AuthRepository implements IAuthRepository {
   }): Promise<Result<LoginResponse>> {
     return Result.wrap(async () => {
       const response = await this.api.emailLogin(
-        LoginRequest.from({
-          email: input.email ?? "",
-          username: input.username ?? "",
-          password: input.password,
-          platform: WEB_PLATFORM,
-          guestId: input.guestId ?? "",
-        }),
+        LoginRequest.from(
+          withTestAccountFlag({
+            email: input.email ?? "",
+            username: input.username ?? "",
+            password: input.password,
+            platform: WEB_PLATFORM,
+            guestId: input.guestId ?? "",
+          }),
+        ),
       );
       await this._saveLoginData(response);
       return response;
@@ -131,7 +136,7 @@ export class AuthRepository implements IAuthRepository {
     });
     return Result.wrap(async () => {
       const response = await this.api.guestLogin(
-        GuestLoginRequest.from({ deviceId }),
+        GuestLoginRequest.from(withTestAccountFlag({ deviceId })),
       );
       log.debug("[AuthRepository.guestLogin] API call SUCCESS (Zod parsed)", {
         hasToken: !!response.token,
@@ -160,11 +165,13 @@ export class AuthRepository implements IAuthRepository {
   }): Promise<Result<LoginResponse>> {
     return this._socialLogin(() =>
       this.api.googleLogin(
-        GoogleLoginRequest.from({
-          idToken: input.idToken,
-          platform: WEB_PLATFORM,
-          guestId: input.guestId ?? "",
-        }),
+        GoogleLoginRequest.from(
+          withTestAccountFlag({
+            idToken: input.idToken,
+            platform: WEB_PLATFORM,
+            guestId: input.guestId ?? "",
+          }),
+        ),
       ),
     );
   }
@@ -176,11 +183,13 @@ export class AuthRepository implements IAuthRepository {
   }): Promise<Result<LoginResponse>> {
     return this._socialLogin(() =>
       this.api.facebookLogin(
-        FacebookLoginRequest.from({
-          accessToken: input.accessToken,
-          platform: WEB_PLATFORM,
-          guestId: input.guestId ?? "",
-        }),
+        FacebookLoginRequest.from(
+          withTestAccountFlag({
+            accessToken: input.accessToken,
+            platform: WEB_PLATFORM,
+            guestId: input.guestId ?? "",
+          }),
+        ),
       ),
     );
   }
@@ -192,10 +201,12 @@ export class AuthRepository implements IAuthRepository {
   }): Promise<Result<LoginResponse>> {
     return this._socialLogin(() =>
       this.api.facebookIdLogin(
-        FbIdLoginRequest.from({
-          fbId: input.fbId,
-          avatarUrl: input.avatarUrl ?? "",
-        }),
+        FbIdLoginRequest.from(
+          withTestAccountFlag({
+            fbId: input.fbId,
+            avatarUrl: input.avatarUrl ?? "",
+          }),
+        ),
       ),
     );
   }
@@ -208,10 +219,12 @@ export class AuthRepository implements IAuthRepository {
   async appleLogin(identityToken: string): Promise<Result<LoginResponse>> {
     return this._socialLogin(() =>
       this.api.appleLogin(
-        AppleLoginRequest.from({
-          identityToken,
-          platform: WEB_PLATFORM,
-        }),
+        AppleLoginRequest.from(
+          withTestAccountFlag({
+            identityToken,
+            platform: WEB_PLATFORM,
+          }),
+        ),
       ),
     );
   }
@@ -305,3 +318,12 @@ export const authRepository = new AuthRepository(
   AuthStorage.getInstance(),
   UserStorage.getInstance(),
 );
+
+function withTestAccountFlag<T extends Record<string, unknown>>(
+  payload: T,
+): T & { isTestAccount: boolean } {
+  return {
+    ...payload,
+    [TEST_ACCOUNT_FLAG]: !AppEnvUtil.isProduction(),
+  };
+}
diff --git a/src/data/schemas/auth/apple_login_request.ts b/src/data/schemas/auth/apple_login_request.ts
index 09da28e1..7edbb09c 100644
--- a/src/data/schemas/auth/apple_login_request.ts
+++ b/src/data/schemas/auth/apple_login_request.ts
@@ -7,6 +7,7 @@ import { z } from "zod";
 export const AppleLoginRequestSchema = z.object({
   identityToken: z.string(),
   platform: z.string(),
+  isTestAccount: z.boolean().default(false),
 });
 
 export type AppleLoginRequestInput = z.input<typeof AppleLoginRequestSchema>;
diff --git a/src/data/schemas/auth/facebook_login_request.ts b/src/data/schemas/auth/facebook_login_request.ts
index 074014ac..48af4794 100644
--- a/src/data/schemas/auth/facebook_login_request.ts
+++ b/src/data/schemas/auth/facebook_login_request.ts
@@ -8,6 +8,7 @@ export const FacebookLoginRequestSchema = z.object({
   accessToken: z.string(),
   platform: z.string(),
   guestId: z.string().default(""),
+  isTestAccount: z.boolean().default(false),
 });
 
 export type FacebookLoginRequestInput = z.input<typeof FacebookLoginRequestSchema>;
diff --git a/src/data/schemas/auth/fb_id_login_request.ts b/src/data/schemas/auth/fb_id_login_request.ts
index d9207346..3efcf151 100644
--- a/src/data/schemas/auth/fb_id_login_request.ts
+++ b/src/data/schemas/auth/fb_id_login_request.ts
@@ -7,6 +7,7 @@ import { z } from "zod";
 export const FbIdLoginRequestSchema = z.object({
   fbId: z.string(),
   avatarUrl: z.string().default(""),
+  isTestAccount: z.boolean().default(false),
 });
 
 export type FbIdLoginRequestInput = z.input<typeof FbIdLoginRequestSchema>;
diff --git a/src/data/schemas/auth/google_login_request.ts b/src/data/schemas/auth/google_login_request.ts
index d39cd0dd..b3d81947 100644
--- a/src/data/schemas/auth/google_login_request.ts
+++ b/src/data/schemas/auth/google_login_request.ts
@@ -8,6 +8,7 @@ export const GoogleLoginRequestSchema = z.object({
   idToken: z.string(),
   platform: z.string(),
   guestId: z.string().default(""),
+  isTestAccount: z.boolean().default(false),
 });
 
 export type GoogleLoginRequestInput = z.input<typeof GoogleLoginRequestSchema>;
diff --git a/src/data/schemas/auth/guest_login_request.ts b/src/data/schemas/auth/guest_login_request.ts
index 09bba9d9..d67bf0d5 100644
--- a/src/data/schemas/auth/guest_login_request.ts
+++ b/src/data/schemas/auth/guest_login_request.ts
@@ -6,6 +6,7 @@ import { z } from "zod";
 
 export const GuestLoginRequestSchema = z.object({
   deviceId: z.string(),
+  isTestAccount: z.boolean().default(false),
 });
 
 export type GuestLoginRequestInput = z.input<typeof GuestLoginRequestSchema>;
diff --git a/src/data/schemas/auth/login_request.ts b/src/data/schemas/auth/login_request.ts
index bcea9aa6..bdbcc324 100644
--- a/src/data/schemas/auth/login_request.ts
+++ b/src/data/schemas/auth/login_request.ts
@@ -10,6 +10,7 @@ export const LoginRequestSchema = z.object({
   password: z.string(),
   platform: z.string(),
   guestId: z.string().default(""),
+  isTestAccount: z.boolean().default(false),
 });
 
 export type LoginRequestInput = z.input<typeof LoginRequestSchema>;
diff --git a/src/data/schemas/auth/register_request.ts b/src/data/schemas/auth/register_request.ts
index 7ed90574..7afec37b 100644
--- a/src/data/schemas/auth/register_request.ts
+++ b/src/data/schemas/auth/register_request.ts
@@ -10,6 +10,7 @@ export const RegisterRequestSchema = z.object({
   password: z.string(),
   platform: z.string(),
   guestId: z.string().default(""),
+  isTestAccount: z.boolean().default(false),
 });
 
 export type RegisterRequestInput = z.input<typeof RegisterRequestSchema>;