feat(auth): mark test accounts in login requests

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);