Remove setters from McpServerOptions.Filters and Handlers

- We can add internal properties later to lazily check if the getters have been used to avoid allocations if we care

Author: halter73

src/ModelContextProtocol.Core/Server/McpServerOptions.cs

@@ -83,35 +83,19 @@ public sealed class McpServerOptions
     public Implementation? KnownClientInfo { get; set; }
 
     /// <summary>
-    /// Gets the filter collections for MCP server handlers.
+    /// Gets or sets the container of handlers used by the server for processing protocol messages.
+    /// </summary>
+    public McpServerHandlers Handlers { get; } = new();
+
+    /// <summary>
+    /// Gets the filter collections for incoming and outgoing messages and requests.
     /// </summary>
     /// <remarks>
     /// This property provides access to filter collections that can be used to modify the behavior
     /// of various MCP server handlers. The first filter added is the outermost (first to execute),
     /// and each subsequent filter wraps closer to the handler.
     /// </remarks>
-    public McpServerFilters Filters
-    {
-        get => field ??= new();
-        set
-        {
-            Throw.IfNull(value);
-            field = value;
-        }
-    }
-
-    /// <summary>
-    /// Gets or sets the container of handlers used by the server for processing protocol messages.
-    /// </summary>
-    public McpServerHandlers Handlers
-    {
-        get => field ??= new();
-        set
-        {
-            Throw.IfNull(value);
-            field = value;
-        }
-    }
+    public McpServerFilters Filters { get; } = new();
 
     /// <summary>
     /// Gets or sets a collection of tools served by the server.