sgl-router: experimental Rust HTTP router for SGLang worker pools (#25851)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

experimental/sgl-router/tests/component/main.rs

@@ -0,0 +1,14 @@
+// SPDX-FileCopyrightText: Copyright (c) 2026 The SGLang Authors
+// SPDX-License-Identifier: Apache-2.0
+
+//! Component-scope integration tests.
+//!
+//! Each submodule exercises a single library component (policy, registry,
+//! discovery, health, tokenizer) via the crate's public API. None of these
+//! tests spin up the full HTTP router; for those see `tests/proxy/`.
+
+mod discovery;
+mod health;
+mod policies;
+mod tokenizer;
+mod workers;