feat: Adds new decay system and SkipSerialization (#2311)

## Summary

- Replaces scan-based decay checking during world saves with an event-driven timer wheel scheduler
- Removes virtual property checks from serialization hot path, achieving 6-8x faster world saves

## Changes

### DecayScheduler (new):
- Timer wheel with 12 HashSet buckets (5-min intervals) + PriorityQueue for active processing
- O(1) register/unregister vs O(n) scan of all items
- Auto start/stop when items exist/empty
- Configurable tick interval with jitter to prevent system synchronization

### Item.cs:
- Added ScheduledDecayTime computed property
- Added UpdateDecayRegistration() called from SetLastMoved(), property setters, AddItem()/RemoveItem()
- Hooks in Visible, Movable, Spawner setters and Delete()

### World.cs:
- Removed _decayQueue, EnqueueForDecay(), ProcessDecay()
- ItemPersistence.Serialize() now tight loop without virtual calls

## Performance

| Metric        | Before     | After     | Improvement |
|---------------|------------|-----------|-------------|
| Items (230K)  | 245K ticks | 34K ticks | 8x faster   |
| Mobiles (43K) | 56K ticks  | 6K ticks  | 9x faster   |
| Total         | 302K ticks | 40K ticks | 7.5x faster |

## Configuration

decay.maxItemsPerTick = 250       # Items processed per tick
decay.tickInterval = 256ms        # Base processing interval
decay.bucketInterval = 5min       # Timer wheel bucket size
decay.jitterMaxMs = 25            # ±25ms tick jitter

Projects/UOContent/Items/Skill Items/Camping/Campfire.cs

@@ -32,6 +32,8 @@ public partial class Campfire : Item
         Timer.StartTimer(TimeSpan.FromSeconds(1.0), TimeSpan.FromSeconds(1.0), OnTick, out _timerToken);
     }
 
+    public override bool SkipSerialization => true;
+
     [CommandProperty(AccessLevel.GameMaster)]
     public CampfireStatus Status
     {
@@ -159,12 +161,6 @@ public partial class Campfire : Item
         _timerToken.Cancel();
         ClearEntries();
     }
-
-    [AfterDeserialization(false)]
-    private void AfterDeserialization()
-    {
-        Delete();
-    }
 }
 
 public class CampfireEntry