feat: fallback can be select by user

hub/executor/executor.go

@@ -351,7 +351,7 @@ func patchSelectGroup(proxies map[string]C.Proxy) {
 			continue
 		}
 
-		selector, ok := outbound.ProxyAdapter.(*outboundgroup.Selector)
+		selector, ok := outbound.ProxyAdapter.(outboundgroup.SelectAble)
 		if !ok {
 			continue
 		}

hub/route/proxies.go

@@ -83,7 +83,7 @@ func updateProxy(w http.ResponseWriter, r *http.Request) {
 	}
 
 	proxy := r.Context().Value(CtxKeyProxy).(*adapter.Proxy)
-	selector, ok := proxy.ProxyAdapter.(*outboundgroup.Selector)
+	selector, ok := proxy.ProxyAdapter.(outboundgroup.SelectAble)
 	if !ok {
 		render.Status(r, http.StatusBadRequest)
 		render.JSON(w, r, newError("Must be a Selector"))