Increase Join-in-Progress Starting Cash by Segment

When joining a multiplayer run in progress, players always start with $1,000. In later segments (e.g., Charlie), $1,000 is effectively a death sentence because you can’t afford even basic survival gear before the next engagement, and you join without a proper kit. Weapon sharing helps, but it doesn’t solve the lack of essential purchases on spawn.

Request: scale the base starting cash by segment, e.g. Alpha: $1,000 / Bravo: $2,000 / Charlie: $3,000, instead of a flat $1,000 for all.