record-daemon: refactor and cleanup

record-daemon/src/recording/output.rs

@@ -59,6 +59,9 @@ pub struct RecordingResult {
     /// Recording duration.
     // #[serde(with = "chrono::serde::seconds")]
     pub duration: Duration,
+    /// Recording statistics (if available).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub stats: Option<RecordingStats>,
 }
 
 impl RecordingResult {
@@ -209,6 +212,7 @@ mod tests {
             start_time: Utc::now(),
             end_time: Utc::now() + Duration::seconds(125),
             duration: Duration::seconds(125),
+            stats: None,
         };
 
         assert_eq!(result.duration_human(), "2m 5s");