feat: add default voices

src/modules/tts-modes/azure.ts

@@ -6,6 +6,7 @@ class AzureTTS implements TTSModule {
 	private voices: Array<string> | undefined = undefined;
 
 	public name: string = 'Azure';
+	public defaultVoice: string = 'en-US-AvaNeural';
 
 	async getVoices(): Promise<Array<string> | undefined> {
 		if (!this.voices) {

src/modules/tts-modes/google.ts

@@ -9,6 +9,8 @@ const USER_AGENT =
 
 const ttsGoogle: TTSModule = {
 	name: 'Google',
+	defaultVoice: 'en',
+
 	async getVoices(): Promise<string[]> { return GOOGLE_TTS_VOICES.voices },
 
 	async generate(voice: string, text: string): Promise<TTSResponse> {