feat(currency_wars): complete systems, settlement Rank SS, damage report, camera and recovery fixes

internal/gameserver/session.go

@@ -207,6 +207,9 @@ func (s *Session) SendRaw(pkt *NetPacket) error {
 
 	s.kcpMu.Lock()
 	defer s.kcpMu.Unlock()
+	if s.kcp == nil {
+		return nil
+	}
 	if _, err := s.kcp.Send(payload); err != nil {
 		return err
 	}