refactor: reorganize imports and improve code formatting across multiple modules

tests/test_index_tts2.rs

@@ -1,8 +1,8 @@
 use std::time::Instant;
-use anyhow::Result;
 
 use aha::models::index_tts2::{generate::IndexTTS2Generate, utils::download_index_tts2_need_model};
 use aha_openai_dive::v1::resources::chat::ChatCompletionParameters;
+use anyhow::Result;
 
 #[tokio::test]
 async fn index_tts2_generate() -> Result<()> {
@@ -45,4 +45,4 @@ async fn index_tts2_generate() -> Result<()> {
     let i_duration = i_start.elapsed();
     println!("Time elapsed in generate is: {:?}", i_duration);
     Ok(())
-}
+}