simplifications and refactorings

frontend/src/api/client.ts

@@ -9,7 +9,6 @@ import type {
 	UserDirectoryResponse,
 	UserMessageResponse,
 	UserMessageQueueStatus,
-	SmtpTestResponse,
 	NowPlayingSession,
 	MonitoringStatus,
 	MonitoringMetrics,
@@ -189,8 +188,5 @@ export const runJob = (jobKey: string, path: string) =>
 export const fetchUserMessageQueueStatus = () =>
 	get<UserMessageQueueStatus>("/api/users/message/status");
 
-export const testUserSmtpConnection = () =>
-	post<SmtpTestResponse>("/api/users/message/test-smtp");
-
 export const sendUserMessage = (formData: FormData) =>
 	postForm<UserMessageResponse>("/api/users/message", formData);