Refactor WebSocket authentication handling by removing auth requirements from the hello message. Update related documentation and schemas to reflect the changes in authentication strategy, simplifying the connection process.

engine/models/ws_v1.py

@@ -19,15 +19,9 @@ class _StrictModel(BaseModel):
 
 
 # Client -> Server messages
-class HelloAuth(_StrictModel):
-    apiKey: Optional[str] = None
-    jwt: Optional[str] = None
-
-
 class HelloMessage(_StrictModel):
     type: Literal["hello"]
     version: Literal["v1"] = Field(..., description="Protocol version, fixed to v1")
-    auth: Optional[HelloAuth] = Field(default=None, description="Auth payload")
 
 
 class SessionStartAudio(_StrictModel):