feat: add health check for MCP servers on dashboard

Add /health endpoint to the MCP server and probe it from the dashboard
on page load to update server status (running/stopped) in real time.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

compliance-mcp/src/main.rs

@@ -41,7 +41,9 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
             StreamableHttpServerConfig::default(),
         );
 
-        let router = axum::Router::new().nest_service("/mcp", service);
+        let router = axum::Router::new()
+            .route("/health", axum::routing::get(|| async { "ok" }))
+            .nest_service("/mcp", service);
         let listener = tokio::net::TcpListener::bind(("0.0.0.0", port)).await?;
         tracing::info!("MCP HTTP server listening on 0.0.0.0:{port}");
         axum::serve(listener, router).await?;