feat: Add voice management functionality with delete capability and UI integration

qwen3-tts-frontend/src/lib/api.ts

@@ -432,6 +432,10 @@ export const voiceDesignApi = {
     return response.data
   },
 
+  delete: async (id: number): Promise<void> => {
+    await apiClient.delete(API_ENDPOINTS.VOICE_DESIGNS.DELETE(id))
+  },
+
   prepareAndCreate: async (data: VoiceDesignCreate): Promise<VoiceDesign> => {
     const response = await apiClient.post<VoiceDesign>(
       API_ENDPOINTS.VOICE_DESIGNS.PREPARE_AND_CREATE,

qwen3-tts-frontend/src/lib/constants.ts

@@ -31,6 +31,7 @@ export const API_ENDPOINTS = {
     LIST: '/voice-designs',
     CREATE: '/voice-designs',
     PREPARE_AND_CREATE: '/voice-designs/prepare-and-create',
+    DELETE: (id: number) => `/voice-designs/${id}`,
     PREPARE_CLONE: (id: number) => `/voice-designs/${id}/prepare-clone`,
   },
 } as const