feat(CS-P3): full siege objective chain - guardian statues (Destructible spawn) + dual Crown Switch hold + throne capture gating

src/GameLogic/PlugIns/PeriodicTasks/CastleSiegeEventPlugIn.cs

@@ -8,6 +8,7 @@ using System.Collections.Concurrent;
 using System.Linq;
 using System.Runtime.InteropServices;
 using MUnique.OpenMU.GameLogic.CastleSiege;
+using MUnique.OpenMU.GameLogic.NPC;
 using MUnique.OpenMU.GameLogic.Views;
 using MUnique.OpenMU.Interfaces;
 using MUnique.OpenMU.PlugIns;
@@ -23,6 +24,8 @@ using MUnique.OpenMU.PlugIns;
 public sealed class CastleSiegeEventPlugIn : IPeriodicTaskPlugIn, ISupportCustomConfiguration<CastleSiegeConfiguration>, ISupportDefaultCustomConfiguration
 {
     private const ushort ValleyOfLorenMapNumber = 30;
+    private const short GuardianStatueNumber = 132; // reuse the "Statue of Saint" destructible definition
+    private static readonly (byte X, byte Y)[] StatuePositions = { (170, 206), (182, 206) };
 
     private static readonly ConcurrentDictionary<IGameContext, CastleSiegeContext> Contexts = new();
 
@@ -76,7 +79,8 @@ public sealed class CastleSiegeEventPlugIn : IPeriodicTaskPlugIn, ISupportCustom
                     await AnnounceAsync(gameContext, "Castle Siege registration is now open! Guild masters, register at the Guardsman in the Valley of Loren.").ConfigureAwait(false);
                     break;
                 case CastleSiegePhase.Siege:
-                    await AnnounceAsync(gameContext, "The Castle Siege has begun! Fight your way to the throne and capture it to win the castle!").ConfigureAwait(false);
+                    await AnnounceAsync(gameContext, "The Castle Siege has begun! Destroy the guardian statues, hold both Crown Switches, then take the throne!").ConfigureAwait(false);
+                    await SpawnGuardianStatuesAsync(gameContext, context).ConfigureAwait(false);
                     await WarpRegisteredMembersToSiegeAsync(gameContext, context).ConfigureAwait(false);
                     break;
                 case CastleSiegePhase.Ownership when context.OwnerGuildName is { } owner:
@@ -97,6 +101,58 @@ public sealed class CastleSiegeEventPlugIn : IPeriodicTaskPlugIn, ISupportCustom
         => gameContext.ForEachPlayerAsync(player =>
             player.InvokeViewPlugInAsync<IShowMessagePlugIn>(p => p.ShowMessageAsync(message, MessageType.GoldenCenter)).AsTask());
 
+    private static async Task SpawnGuardianStatuesAsync(IGameContext gameContext, CastleSiegeContext context)
+    {
+        try
+        {
+            if (gameContext is not GameContext concrete)
+            {
+                context.SetStatueCount(0);
+                return;
+            }
+
+            var map = await gameContext.GetMapAsync(ValleyOfLorenMapNumber).ConfigureAwait(false);
+            var statueDef = gameContext.Configuration.Monsters.FirstOrDefault(m => m.Number == GuardianStatueNumber);
+            if (map is null || statueDef is null)
+            {
+                context.SetStatueCount(0);
+                return;
+            }
+
+            var spawned = 0;
+            for (var i = 0; i < StatuePositions.Length; i++)
+            {
+                var pos = StatuePositions[i];
+                var spawnArea = new MonsterSpawnArea
+                {
+                    MonsterDefinition = statueDef,
+                    Quantity = 1,
+                    X1 = pos.X,
+                    X2 = pos.X,
+                    Y1 = pos.Y,
+                    Y2 = pos.Y,
+                    Direction = Direction.South,
+                    SpawnTrigger = SpawnTrigger.OnceAtEventStart,
+                };
+
+                var npc = await concrete.MapInitializer.InitializeSpawnAsync(1000 + i, map, spawnArea).ConfigureAwait(false);
+                if (npc is AttackableNpcBase attackable)
+                {
+                    attackable.Died += (_, _) => context.NotifyStatueDestroyed();
+                    spawned++;
+                }
+            }
+
+            context.SetStatueCount(spawned);
+        }
+        catch (Exception ex)
+        {
+            gameContext.LoggerFactory.CreateLogger<CastleSiegeEventPlugIn>()
+                .LogError(ex, "Castle Siege: error while spawning guardian statues.");
+            context.SetStatueCount(0);
+        }
+    }
+
     private static async Task WarpRegisteredMembersToSiegeAsync(IGameContext gameContext, CastleSiegeContext context)
     {
         try