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>

internal/shortcuts/shortcuts.go

@@ -59,6 +59,11 @@ func MakeNormalizer(cfg config.ShortcutsConfig) func(string) string {
 // It normalizes the name (strips configured domains, applies rewrites, optionally strips hyphens) then
 // replaces any remaining dots with underscores so the result is a valid identifier.
 func AliasName(name string, cfg config.ShortcutsConfig) string {
-	s := Normalize(name, cfg)
+	// Shorten only the hostname: anchored rewrite rules must not see "instance/".
+	prefix := ""
+	if source, host, ok := strings.Cut(name, "/"); ok {
+		prefix, name = strings.ToLower(source)+"_", host
+	}
+	s := prefix + Normalize(name, cfg)
 	return strings.NewReplacer(".", "_", "/", "_").Replace(s)
 }

internal/shortcuts/shortcuts_test.go

@@ -115,3 +115,13 @@ func TestNormalizeRewritesOrder(t *testing.T) {
 		t.Fatalf("got %q", got)
 	}
 }
+
+func TestAliasNameRewritesInstanceQualifiedHosts(t *testing.T) {
+	cfg := config.ShortcutsConfig{
+		Domains:  []string{".hoster.test"},
+		Rewrites: []config.ShortcutRewrite{{Pattern: `^([a-z]+)[0-9]+-`, Replace: "$1"}},
+	}
+	if got := shortcuts.AliasName("fsn/fsn1-pve1.hoster.test", cfg); got != "fsn_fsnpve1" {
+		t.Fatalf("got %q", got)
+	}
+}