fix(rustproxy): Cancel connections for routes removed/disabled by adding per-route cancellation tokens and make RouteManager swappable (ArcSwap) for runtime updates

rust/crates/rustproxy/src/lib.rs

@@ -610,6 +610,8 @@ impl RustProxy {
         // Update listener manager
         if let Some(ref mut listener) = self.listener_manager {
             listener.update_route_manager(Arc::clone(&new_manager));
+            // Cancel connections on routes that were removed or disabled
+            listener.invalidate_removed_routes(&active_route_ids);
             // Prune HTTP proxy caches (rate limiters, regex cache, round-robin counters)
             listener.prune_http_proxy_caches(&active_route_ids);