Route the game's `money.delta` events into the web banking system so a
player's personal bank account tracks their in-game wallet.
- New `processMoneyEvent` (src/lib/arma-bridge/money.ts) applies a parsed
money delta to the player's personal account: debits go to the unit
treasury (or leave if no treasury), refunds hit the treasury first and
fall back to a plain deposit, and rewards/grants deposit directly.
- Wire the handler into ArmaSyncEvents and add a `POST /api/arma/v1/balances`
route (get_balances) that returns personal balances for Steam IDs, omitting
unlinked IDs so the game keeps its own stored value.
- Events dedupe by serverId+eventId so a retried delivery never
double-charges, and the whole path never throws.
