prevent audio as image url

pkg/providers/openai_compat/provider.go

@@ -323,6 +323,7 @@ func serializeMessages(messages []Message) []any {
 			})
 		}
 		for _, mediaURL := range m.Media {
+			if strings.HasPrefix(mediaURL, "data:image/") {
 				parts = append(parts, map[string]any{
 					"type": "image_url",
 					"image_url": map[string]any{
@@ -330,6 +331,7 @@ func serializeMessages(messages []Message) []any {
 					},
 				})
 			}
+		}
 
 		msg := map[string]any{
 			"role":    m.Role,