feat: 公开宿主组合加载 API、Forge 风格依赖版本区间与加载顺序、程序集解析策略

- ShrinkModComponentDiscovery.Discover 公开：只发现、不执行生命周期
- ShrinkModLoader.LoadComposed / ShrinkModCordisRuntime.ApplyComposedAsync：宿主提供元数据组合加载，支持纯数据包与 IShrinkModWrapper 公开真实实例
- 公开 TryAttachEventBusInstance，随生命周期逆操作释放
- 依赖新增 VersionRange（Maven/Forge 区间语法）与 Ordering（Before/After）
- AssemblyResolvePolicy 可限制跨模组程序集解析

Runtime/Context/ShrinkModComponentDiscovery.cs

@@ -10,9 +10,29 @@ namespace ShrinkModFramework
     /// 把工程内程序集和外部 DLL 的当前 revision 投影为延迟组件源。
     /// 同一路径的旧外部程序集无法从 Mono AppDomain 卸载，但不会再进入候选集合。
     /// </summary>
-    internal static class ShrinkModComponentDiscovery
+    public static class ShrinkModComponentDiscovery
     {
         public static IReadOnlyList<ShrinkModComponentSource> Discover(
+            ShrinkModFrameworkSettings settings, IEnumerable<string> authorizedDllPaths) =>
+            Discover(settings, settings != null && settings.verboseLogging, authorizedDllPaths);
+
+        /// <summary>只发现，不构造实例或提交 current revision。WithMetadata 可保留发现快照。</summary>
+        public static IReadOnlyList<ShrinkModComponentSource> Discover(
+            ShrinkModFrameworkSettings settings, bool verboseLogging, IEnumerable<string> authorizedDllPaths)
+        {
+            if (authorizedDllPaths == null) throw new ArgumentNullException(nameof(authorizedDllPaths));
+            var previous = ShrinkExternalModAssemblyLoader.CaptureState();
+            try
+            {
+                var sources = DiscoverCurrent(settings, verboseLogging, authorizedDllPaths);
+                var state = ShrinkExternalModAssemblyLoader.CaptureState();
+                foreach (var source in sources) source.DiscoveryState = state;
+                return sources;
+            }
+            finally { ShrinkExternalModAssemblyLoader.RestoreState(previous); }
+        }
+
+        internal static IReadOnlyList<ShrinkModComponentSource> DiscoverCurrent(
             ShrinkModFrameworkSettings settings,
             bool verboseLogging,
             IEnumerable<string> authorizedDllPaths)
@@ -53,7 +73,7 @@ namespace ShrinkModFramework
                     var dependencies = type
                         .GetCustomAttributes<ShrinkModDependencyAttribute>(false)
                         .Select(attribute => new ShrinkModDependency(
-                            attribute.ModId, attribute.MinimumVersion, attribute.Optional))
+                            attribute.ModId, attribute.MinimumVersion, attribute.Optional, attribute.Ordering, attribute.VersionRange))
                         .ToArray();
                     var info = new ShrinkModInfo(
                         modAttribute.ModId,