A young former Charlton midfielder has agreed to join National League South Tonbridge on a permanent basis this summer. Jeremy Santos, 21, has enjoyed two separate stints on loan with Jay Saunders’ side – the second quickly ended by a serious injury he sustained at Dartford. Santos, who has dual-nationality with Ecuador, had been at The Valley since he was nine and progressed through the youth ranks before earning his first professional contract in 2021. But Tonbridge confirmed on Tuesday morning that Santos is back at Longmead for more. “(I am) absolutely delighted to bring Santos back to the…