feat(live): add team radio ticker

Subscribe to TeamRadio on the F1 live feed, parse defensive capture snapshots and patches, and relay capped captures through live snapshots with the SessionInfo static path. Add the frontend CDN URL helper and ticker using one shared audio element.

internal/live/types.go

@@ -85,6 +85,7 @@ type LiveSessionMeta struct {
 	CircuitName string
 	SessionType string
 	SessionName string
+	Path        string
 }
 
 // LivePositionData is the latest raw F1 GPS position for one driver.
@@ -144,6 +145,13 @@ type LiveStintData struct {
 	Laps     int
 }
 
+// LiveRadioCapture is one team radio audio clip from the live timing feed.
+type LiveRadioCapture struct {
+	Utc          string
+	RacingNumber string
+	Path         string
+}
+
 // LiveStreamData is an immutable snapshot of all live timing state.
 type LiveStreamData struct {
 	Drivers            map[string]LiveDriverData
@@ -153,6 +161,7 @@ type LiveStreamData struct {
 	RCMessages         []LiveRCMessage
 	Weather            LiveWeatherData
 	Session            LiveSessionMeta
+	TeamRadio          []LiveRadioCapture
 	TrackStatus        string // "1"=green "2"=yellow "4"=SC "5"=red "6"=VSC
 	CurrentLap         int
 	TotalLaps          int