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

Tools~/HostTests/Runtime/Runtime.csproj

@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework><AssemblyName>ShrinkModFramework.Runtime</AssemblyName>
+    <Nullable>disable</Nullable><ShrinkCodeGenEnabled>false</ShrinkCodeGenEnabled>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="../../../Runtime/**/*.cs" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+    <PackageReference Include="ShrinkSDK.Context.Core" Version="0.3.1" />
+    <PackageReference Include="ShrinkSDK.EventBus" Version="2.3.1" />
+  </ItemGroup>
+</Project>
+