feat(plugins): change websockets Data field type to []byte for binary support

Signed-off-by: Deluan <deluan@navidrome.org>

plugins/capabilities/websocket_callback.go

@@ -38,7 +38,7 @@ type OnBinaryMessageRequest struct {
 	// ConnectionID is the unique identifier for the WebSocket connection that received the message.
 	ConnectionID string `json:"connectionId"`
 	// Data is the binary data received from the WebSocket, encoded as base64.
-	Data string `json:"data"`
+	Data []byte `json:"data"`
 }
 
 // OnErrorRequest is the request provided when an error occurs on a WebSocket connection.

plugins/capabilities/websocket_callback.yaml

@@ -30,6 +30,7 @@ components:
                     description: ConnectionID is the unique identifier for the WebSocket connection that received the message.
                 data:
                     type: string
+                    format: byte
                     description: Data is the binary data received from the WebSocket, encoded as base64.
             required:
                 - connectionId