feat(server): activate projected authentication safely

tools/tht/internal/setup/files_unsupported.go

@@ -0,0 +1,11 @@
+//go:build !linux
+
+package setup
+
+import "errors"
+
+func currentEffectiveUID() int { return -1 }
+
+func ensureProjectedAuthDirectories(_, _ string) error {
+	return errors.New("runtime authentication projection setup is unsupported")
+}