fix(Core/Movement): DAMAGE_FALL_TO_VOID bypasses all immunities (#25211)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/server/game/Entities/Player/Player.cpp

@@ -769,7 +769,9 @@ bool Player::IsImmuneToEnvironmentalDamage()
 
 uint32 Player::EnvironmentalDamage(EnviromentalDamage type, uint32 damage)
 {
-    if (IsImmuneToEnvironmentalDamage())
+    // DAMAGE_FALL_TO_VOID bypasses all immunities (e.g. Divine Shield) to prevent
+    // players from being stuck infinitely falling below the map
+    if (type != DAMAGE_FALL_TO_VOID && IsImmuneToEnvironmentalDamage())
         return 0;
 
     // Absorb, resist some environmental damage type