[fast_inference] Make API Great Again And Again (#923)

* 为fast_inference分支适配新的WebAPI

* modified:   api_v2.py

* 修改文档细节

* modified:   api_v2.py

* 优化了代码逻辑，提升健壮性

* 修改文档细节

* 修改文档细节

* 优化代码逻辑

* 修改注释细节

GPT_SoVITS/TTS_infer_pack/TTS.py

@@ -844,6 +844,7 @@ class TTS:
             self.vits_model = None
             self.init_t2s_weights(self.configs.t2s_weights_path)
             self.init_vits_weights(self.configs.vits_weights_path)
+            raise e
         finally:
             self.empty_cache()