chore: import upstream snapshot with attribution

Sources/Services/Network/Server/NetworkService.swift

@@ -0,0 +1,35 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 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 ContainerResource
+import ContainerXPC
+import ContainerizationExtras
+
+/// A network service
+public protocol NetworkService: Sendable {
+    /// Gets the properties of the realized network.
+    func status() async throws -> NetworkStatus
+
+    /// Register a hostname and allocate associated addresses.
+    func allocate(
+        hostname: String,
+        macAddress: MACAddress?,
+        session: XPCServerSession
+    ) async throws -> (attachment: Attachment, additionalData: XPCMessage?)
+
+    /// Return the attachment for a hostname if it is registered with the network.
+    func lookup(hostname: String) async throws -> Attachment?
+}