fix(server): handle router setup panic and return error

* return error from New function if route registration panics
* add googleDispatch to handle model:action routing

cmd/vecna/serve.go

@@ -58,7 +58,10 @@ func runServe(cmd *cobra.Command, _ []string) error {
 		reg = metrics.New()
 	}
 
-	router := server.New(cfg, clients, adp, reg, logger)
+	router, err := server.New(cfg, clients, adp, reg, logger)
+	if err != nil {
+		return fmt.Errorf("build router: %w", err)
+	}
 
 	addr := fmt.Sprintf("%s:%d", cfg.Server.Host, cfg.Server.Port)
 	srv := &http.Server{