fix: Defer plugin loading to avoid circular dependency

Author: ELDment

managed/src/SwiftlyS2.Core/Hosting/PluginManagerInjection.cs

@@ -13,6 +13,6 @@ public static IServiceCollection AddPluginManager( this IServiceCollection self
 
     public static void UsePluginManager( this IServiceProvider self )
     {
-        _ = self.GetRequiredService<PluginManager>();
+        self.GetRequiredService<PluginManager>().Initialize();
     }
 }

managed/src/SwiftlyS2.Core/Modules/Plugins/PluginManager.cs

@@ -150,7 +150,13 @@ static async Task WaitForFileAccess( CancellationToken token, string filePath, i
                 ? Assembly.GetExecutingAssembly()
                 : AppDomain.CurrentDomain.GetAssemblies().FirstOrDefault(a => loadingAssemblyName == a.GetName().Name);
         };
+    }
 
+    /// <summary>
+    /// Must be called after DI container is fully built to avoid circular dependency.
+    /// </summary>
+    internal void Initialize()
+    {
         LoadExports();
         LoadPlugins();
     }