Warn user when a named volume is auto-created

When a container references a named volume that doesn't exist, it is
silently created. This adds a warning message so users are aware of
the implicit resource creation, addressing the TODO in Utility.swift.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: poetryofcode

Sources/Services/ContainerAPIService/Client/Utility.swift

@@ -347,13 +347,15 @@ public struct Utility {
         let labels = parsed.isAnonymous ? [Volume.anonymousLabel: ""] : [:]
 
         let volume: Volume
+        var wasCreated = false
         do {
             volume = try await ClientVolume.create(
                 name: parsed.name,
                 driver: "local",
                 driverOpts: [:],
                 labels: labels
             )
+            wasCreated = true
         } catch let error as VolumeError {
             guard case .volumeAlreadyExists = error else {
                 throw error
@@ -368,7 +370,9 @@ public struct Utility {
             volume = try await ClientVolume.inspect(parsed.name)
         }
 
-        // TODO: Warn user if named volume was auto-created
+        if wasCreated && !parsed.isAnonymous {
+            print("Warning: volume \"\(parsed.name)\" not found, auto-created")
+        }
 
         return volume
     }