Add WebRTC support and remove deviceId from apis

server/internal/lobby/types.go

@@ -65,7 +65,7 @@ type DriverMeta struct {
 	LastSeenMs  int64        `json:"last_seen_ms"`
 	Country     string       `json:"country,omitempty"` // optional, for UI
 	AvatarHue   int          `json:"avatar_hue,omitempty"` // 0..360, deterministic per id
-	DeviceID    *int         `json:"device_id,omitempty"`
+	DeviceID    *int         `json:"-"`
 }
 
 // Snapshot is the immutable view broadcast to clients.