Run paychecks in async thread and fix society check

Move the paycheck loop into a CreateThread to avoid blocking the main thread and prevent paychecks from stopping. Add a nil guard for Player and keep existing payment lookup logic. Tighten society payroll logic: check the society account balance before removing funds and still pay employees if the account is zero, avoiding duplicate AddMoney/Notify branches. Add a short Wait(50) between player iterations to yield. Preserve the existing SetTimeout scheduling for the next paycheck run.

server/functions.lua

@@ -405,8 +405,9 @@ function PaycheckInterval()
         SetTimeout(QBCore.Config.Money.PayCheckTimeOut * (60 * 1000), PaycheckInterval) -- Prevent paychecks from stopping forever once 0 players
         return
     end
+    CreateThread(function()
         for _, Player in pairs(QBCore.Players) do
-        if not Player then return end
+            if Player then
                 local payment = QBShared.Jobs[Player.PlayerData.job.name]['grades'][tostring(Player.PlayerData.job.grade.level)].payment
                 if not payment then payment = Player.PlayerData.job.payment end
                 if Player.PlayerData.job and payment > 0 and (QBShared.Jobs[Player.PlayerData.job.name].offDutyPay or Player.PlayerData.job.onduty) then
@@ -429,7 +430,10 @@ function PaycheckInterval()
                         TriggerClientEvent('QBCore:Notify', Player.PlayerData.source, Lang:t('info.received_paycheck', { value = payment }))
                     end
                 end
+                Wait(50)
             end
+        end
+    end)
     SetTimeout(QBCore.Config.Money.PayCheckTimeOut * (60 * 1000), PaycheckInterval)
 end