Use rune natural attack range for siege engines

Siege engine range was hardcoded to 300. Read it from the rune natural
attack instead (350 for Trebuchet, Mangonel and Ballista), matching the
client's RecalcMinWeaponRange. Falls back to 300 if the rune has none.
getNaturalAttack now returns the whole entry so speed and range share
the lookup.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/objects/AbstractCharacter.java

@@ -1476,7 +1476,7 @@ public abstract class AbstractCharacter extends AbstractWorldObject {
             Mob mob = (Mob) this;
 
             if (mob.isSiege()) {
-                return 300;
+                return CombatManager.getSiegeRange(mob);
             }
             float range = 8;
             if ((this).charItemManager.equipped.get(EquipSlotType.RHELD) != null) {