Route templates: a route named x-* serves any request route x-<something>

Implemented-By: OpenCode session (model recorded in docs/implementer-log.md)

cmd/crossbar/main.go

@@ -104,7 +104,7 @@ func run() error {
 			checker = identity.NewHeaderChecker()
 		}
 		handler = identity.Middleware(checker, func(route string) ([]string, bool) {
-			rt, ok := cfg.Routes[route]
+			rt, _, ok := cfg.Route(route)
 			return rt.Peers, ok
 		}, p)
 	}