feat: 重构事件总线为可实例化架构并发布 1.3.0

- 新增 IShrinkEventBus、ShrinkEventBusBuilder 与 ShrinkEventBusInstance，支持独立 bus、异常策略、启动开关、类型校验和按 phase 派发
- 新增 SubscribeEvent 可释放订阅句柄与订阅快照接口，保留 EventBus 静态门面并委托到默认实例
- 重构监听列表为父子事件链共享锁与快照缓存，支持父事件监听子事件、跨父子数字优先级归并和防御性快照拷贝
- 优化 EventBase 元数据缓存、懒生成 EventId、派发快照挂接与对象池双重归还保护，移除旧 EventCache 热路径
- 恢复本地 ILPostProcessor 兜底并生成静态订阅注册表，避免共享 CodeGen 覆盖外程序集自动注册失效
- 改进事件查看器、Benchmark、README 与 CHANGELOG，并新增 Dispatch/Priority/Registration/Subscription 测试覆盖核心行为

BREAKING CHANGE: 移除 EventBase.GetListenerList()，int 数字优先级重载不再提供默认值，数字优先级 0 现在映射为 NORMAL。

Runtime/EventHandlerInfo.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Reflection;
+using Cysharp.Threading.Tasks;
 #pragma warning disable CS8632 // 只能在 "#nullable" 注释上下文内的代码中使用可为 null 的引用类型的注释。
 
 
@@ -12,7 +13,10 @@ namespace ShrinkEventBus
 
     public class EventHandlerInfo
     {
+        public long SubscriptionId { get; }
         public Delegate Handler { get; }
+        internal Action<EventBase>? SyncInvoker { get; }
+        internal Func<EventBase, UniTask>? AsyncInvoker { get; }
         public EventPriority Priority { get; }
         public int NumericPriority { get; }
         public bool ReceiveCanceled { get; }
@@ -24,11 +28,17 @@ namespace ShrinkEventBus
         public MethodInfo? OriginalMethod { get; }
         public string OriginalMethodName { get; }
         public Type? OriginalDeclaringType { get; }
+        public DateTime RegisteredAtUtc { get; }
 
-        public EventHandlerInfo(Delegate handler, EventPriority priority, int numericPriority,
-            bool receiveCanceled, string debugInfo = "", MethodInfo? originalMethod = null)
+        private EventHandlerInfo(long subscriptionId, Delegate handler, Action<EventBase>? syncInvoker,
+            Func<EventBase, UniTask>? asyncInvoker,
+            EventPriority priority, int numericPriority, bool receiveCanceled, string debugInfo = "",
+            MethodInfo? originalMethod = null)
         {
+            SubscriptionId = subscriptionId;
             Handler = handler;
+            SyncInvoker = syncInvoker;
+            AsyncInvoker = asyncInvoker;
             Priority = priority;
             NumericPriority = numericPriority;
             ReceiveCanceled = receiveCanceled;
@@ -50,6 +60,8 @@ namespace ShrinkEventBus
                 OriginalMethodName = MethodName;
                 OriginalDeclaringType = DeclaringType;
             }
+
+            RegisteredAtUtc = DateTime.UtcNow;
         }
 
         private static MethodInfo? ExtractOriginalMethodFromWrapper(Delegate handler)
@@ -64,5 +76,66 @@ namespace ShrinkEventBus
 
         public string DisplayMethodName => OriginalMethodName;
         public Type DisplayDeclaringType => OriginalDeclaringType ?? DeclaringType;
+
+        public bool MatchesMethod(MethodInfo method)
+        {
+            return method != null && (ReferenceEquals(Method, method) || ReferenceEquals(OriginalMethod, method));
+        }
+
+        public bool MatchesDeclaringType(Type declaringType)
+        {
+            return declaringType != null &&
+                   (DeclaringType == declaringType || OriginalDeclaringType == declaringType);
+        }
+
+        public static EventHandlerInfo Create(long subscriptionId, Delegate handler, Type eventType,
+            EventPriority priority, int numericPriority, bool receiveCanceled, string debugInfo = "",
+            MethodInfo? originalMethod = null)
+        {
+            if (handler == null)
+                throw new System.ArgumentNullException(nameof(handler));
+            if (eventType == null)
+                throw new System.ArgumentNullException(nameof(eventType));
+
+            Action<EventBase>? syncInvoker = null;
+            Func<EventBase, UniTask>? asyncInvoker = null;
+            if (handler.Method.ReturnType == typeof(void))
+                syncInvoker = CreateSyncInvoker(eventType, handler);
+            else if (handler.Method.ReturnType == typeof(UniTask))
+                asyncInvoker = CreateAsyncInvoker(eventType, handler);
+            else
+                throw new System.ArgumentException(
+                    $"Unsupported event handler return type {handler.Method.ReturnType.FullName} for {handler.Method}.");
+
+            return new EventHandlerInfo(subscriptionId, handler, syncInvoker, asyncInvoker, priority, numericPriority,
+                receiveCanceled, debugInfo, originalMethod);
+        }
+
+        private static Action<EventBase> CreateSyncInvoker(Type eventType, Delegate handler)
+        {
+            var factory = typeof(EventHandlerInfo).GetMethod(nameof(CreateSyncInvokerGeneric),
+                BindingFlags.NonPublic | BindingFlags.Static)!.MakeGenericMethod(eventType);
+            return (Action<EventBase>)factory.Invoke(null, new object[] { handler })!;
+        }
+
+        private static Func<EventBase, UniTask> CreateAsyncInvoker(Type eventType, Delegate handler)
+        {
+            var factory = typeof(EventHandlerInfo).GetMethod(nameof(CreateAsyncInvokerGeneric),
+                BindingFlags.NonPublic | BindingFlags.Static)!.MakeGenericMethod(eventType);
+            return (Func<EventBase, UniTask>)factory.Invoke(null, new object[] { handler })!;
+        }
+
+        private static Action<EventBase> CreateSyncInvokerGeneric<TEvent>(Delegate handler) where TEvent : EventBase
+        {
+            var typedHandler = (Action<TEvent>)handler;
+            return eventArgs => typedHandler((TEvent)eventArgs);
+        }
+
+        private static Func<EventBase, UniTask> CreateAsyncInvokerGeneric<TEvent>(Delegate handler)
+            where TEvent : EventBase
+        {
+            var typedHandler = (Func<TEvent, UniTask>)handler;
+            return eventArgs => typedHandler((TEvent)eventArgs);
+        }
     }
-}
+}