daily merchant app login fix

services/userService.go

@@ -51,7 +51,28 @@ func (s *userService) TenantLogin(user models.User) (models.TenantUserInfo, erro
 		return models.TenantUserInfo{}, errors.New("user not found")
 	}
 
-	return s.repo.GetTenantUserByID(uid)
+	// `GetTenantUserById`, NOT `GetTenantUserByID`.
+	//
+	// The two differ by one letter and by twenty-eight columns. The capital-ID
+	// one selects five — userid, authname, contactno, tenantid, tenantname —
+	// so this function used to answer with a record whose name, branch, region
+	// and coordinates were all blank. That is why routing
+	// `/mob/users/tenant/login` at it was never as simple as swapping the
+	// handler: the app would have received a mostly-empty object.
+	//
+	// The lowercase-d one is the query `AppLogin` and `TenantWebLogin` already
+	// use, and it fills the whole record. It is now the only one anything calls.
+	//
+	// The FCM token is stored here rather than left to the repository, because
+	// the full read does not write. Only a real token is stored: a login that
+	// omits it must not wipe the device already registered, which is exactly
+	// what "userfcmtoken": "your_fcm_token_here" did to a live account during
+	// this investigation.
+	if strings.TrimSpace(user.Userfcmtoken) != "" {
+		_ = s.repo.UpdateUserFcmToken(uid, user.Userfcmtoken)
+	}
+
+	return s.repo.GetTenantUserById(uid), nil
 }
 
 func (s *userService) UpdateStaff(user models.User) error {