fix(CS-P4): Guard portal uses Land of Trials entry ExitGate (no spawn gate exists)

Land of Trials (31) has no IsSpawnGate, so SafeZoneSpawnGate was null -> portal
said 'not available'. Fall back to the map's single entry ExitGate (60-69,10-19,
the real map entrance) so owner-guild members actually warp in.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/GameLogic/CastleSiege/CastleSiegeHuntingPortalTalkPlugIn.cs

@@ -4,6 +4,7 @@
 
 namespace MUnique.OpenMU.GameLogic.CastleSiege;
 
+using System.Linq;
 using System.Runtime.InteropServices;
 using MUnique.OpenMU.GameLogic.NPC;
 using MUnique.OpenMU.GameLogic.PlugIns;
@@ -45,7 +46,11 @@ public class CastleSiegeHuntingPortalTalkPlugIn : IPlayerTalkToNpcPlugIn
         }
 
         var map = await player.GameContext.GetMapAsync((ushort)CastleSiegeMapAccess.CastleHuntingMapNumber).ConfigureAwait(false);
-        if (map?.SafeZoneSpawnGate is not { } gate)
+
+        // Land of Trials has no spawn gate defined; fall back to its single entry ExitGate (the designated
+        // map entrance at ~60-69,10-19) so the player lands on walkable ground.
+        var gate = map?.SafeZoneSpawnGate ?? map?.Definition.ExitGates?.FirstOrDefault();
+        if (gate is null)
         {
             await ShowAsync(player, "The castle hunting ground is not available right now.").ConfigureAwait(false);
             return;