chore: import upstream snapshot with attribution

Sources/ContainerCommands/System/SystemCommand.swift

@@ -0,0 +1,43 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2025-2026 Apple Inc. and the container project authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//===----------------------------------------------------------------------===//
+
+import ArgumentParser
+import ContainerAPIClient
+
+extension Application {
+    public struct SystemCommand: AsyncLoggableCommand {
+        public init() {}
+        public static let configuration = CommandConfiguration(
+            commandName: "system",
+            abstract: "Manage system components",
+            subcommands: [
+                SystemDF.self,
+                SystemDNS.self,
+                SystemKernel.self,
+                SystemLogs.self,
+                SystemProperty.self,
+                SystemStart.self,
+                SystemStatus.self,
+                SystemStop.self,
+                SystemVersion.self,
+            ],
+            aliases: ["s"]
+        )
+
+        @OptionGroup
+        public var logOptions: Flags.Logging
+    }
+}