Refactor and clean up TTSFM web and core modules

This commit improves code organization, formatting, and import order across the ttsfm-web Flask app, i18n, websocket handler, and run script. It also refactors the main ttsfm package __init__.py for clearer exports, updates async_client.py for better logging and structure, and removes unnecessary imports in audio.py. Minor test import order fixes are included. No functional changes are introduced.

Author: dbccccccc

tests/test_clients.py

@@ -1,9 +1,10 @@
-import pytest
 import types
 
-from ttsfm.client import TTSClient
+import pytest
+
 from ttsfm.async_client import AsyncTTSClient
-from ttsfm.models import TTSResponse, AudioFormat
+from ttsfm.client import TTSClient
+from ttsfm.models import AudioFormat, TTSResponse
 
 
 def _mk_response(data: bytes) -> TTSResponse:

tests/test_utils.py

@@ -57,8 +57,8 @@ def test_header_generation_deterministic_upgrade_flag(monkeypatch):
 @pytest.mark.asyncio
 async def test_async_batch_propagates_original_exception(monkeypatch):
     from ttsfm.async_client import AsyncTTSClient
-    from ttsfm.models import TTSRequest, Voice
     from ttsfm.exceptions import NetworkException
+    from ttsfm.models import TTSRequest, Voice
 
     client = AsyncTTSClient()