♻️ Unit test fix: refactor voice_app #1177

Author: WMC001

test/backend/services/test_voice_service.py

@@ -28,7 +28,7 @@ def __init__(self, config):
         self.config = config
         self.check_connectivity = AsyncMock(return_value=True)
 
-    def generate_speech(self, text: str, stream: bool = False):
+    async def generate_speech(self, text: str, stream: bool = False):
         """Mock implementation that returns appropriate data based on stream parameter"""
         if stream:
             # Return an async generator for streaming