add docstrings

add documentation tags

add some error handling

src/vmr_http/dependencies.py

@@ -1,5 +1,8 @@
+"""module containing dependencies for the API endpoints."""
+
 from fastapi import Request
 
 
 def get_voicemeeter_client(request: Request):
+    """Dependency to get the Voicemeeter client from the application state."""
     return request.app.state.voicemeeter