fix: interface_name strategy, instance hosts in sftp/scp, alias rewrites

Found by the new Docker test environment against a real NetBox 4.7:

- The interface_name strategy filtered IP addresses with interface_name
  and vminterface_name, which NetBox ignores, so it returned the first
  address of the host instead of the named interface's. Use the real
  filters interface and vminterface; a missing interface (HTTP 400)
  falls through to the next strategy.
- sftp and scp took instance-qualified hosts (prod/web01:/path) for
  local paths, because a "/" comes before the ":". Such arguments are
  remote when the prefix is a configured NetBox instance.
- Shell aliases of instance-qualified hosts ran the shortcut rules on
  "instance/host", so anchored rewrite rules never matched.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

cmd/netssh/main.go

@@ -130,6 +130,7 @@ func findDestination(client internalssh.Client, args []string) (*destination, er
 // runClient resolves the NetBox host in args and execs ssh, sftp, or scp.
 func runClient(client internalssh.Client, flags internalssh.WrapperFlags, args []string) {
 	cfg := loadConfigOrSetup()
+	client = client.WithInstances(instanceNames(cfg))
 
 	dest, err := findDestination(client, args)
 	if err != nil {
@@ -175,6 +176,15 @@ func hostDefaults(cfg *config.Config, host resolvedHost) (string, int) {
 	return user, port
 }
 
+// instanceNames lists the named NetBox instances, which may prefix hostnames.
+func instanceNames(cfg *config.Config) []string {
+	names := make([]string, 0, len(cfg.NetBoxes))
+	for _, source := range cfg.NetBoxes {
+		names = append(names, source.Name)
+	}
+	return names
+}
+
 // prependArgs puts extra before args and shifts the destination indices.
 func prependArgs(extra, args []string, dests []int) []string {
 	for i := range dests {