fix: 修复 save_voice_material IPC 调用参数包装错误，改为直接传入 material 对象

tauri-app/src/api/modules/voice.ts

@@ -182,7 +182,7 @@ export async function loadVoiceMaterials(): Promise<VoiceMaterial[]> {
 
 /** 保存音色素材到本地 */
 export async function saveVoiceMaterial(material: VoiceMaterial): Promise<void> {
-  const result = await invoke<{ code: number; message: string }>('save_voice_material', { args: material });
+  const result = await invoke<{ code: number; message: string }>('save_voice_material', material);
   if (result.code !== 200) {
     throw new Error(result.message || '保存素材失败');
   }