Add Extended and Drum Magazines

Add higher-capacity magazine options for compatible weapons. Examples could include 40-round and 60-round rifle magazines, as well as 50-round or 75-round drum magazines for AK-platform weapons. Their increased ammunition capacity could be balanced through slower reloads, reduced ADS and weapon-handling speed, additional weight, and faster arm fatigue. This would give players more sustained firepower at the cost of mobility and responsiveness.