revert __init__ imports with suggested __all__ workaround for flake8

src/endpoints/__init__.py

@@ -0,0 +1,7 @@
+from .categorize import categorize 
+from .summarize import summarize
+from .transcription import transcription
+from .analyze import analyze
+from .server_info import server_info
+
+__all__ = ['categorize', 'summarize', 'transcription', 'analyze', 'server_info']