build: update GOPROXY to proxy.golang.org in Dockerfile and docker-compose build arguments.

Dockerfile

@@ -9,7 +9,7 @@
 ARG NODE_IMAGE=node:20-alpine
 ARG GOLANG_IMAGE=golang:1.23-alpine
 ARG ALPINE_IMAGE=alpine:3.20
-ARG GOPROXY=https://goproxy.cn,direct
+ARG GOPROXY=https://proxy.golang.org,direct
 
 # -----------------------------------------------------------------------------
 # Stage 1: Frontend Builder

docker-compose.yml

@@ -15,6 +15,8 @@ services:
     build:
       context: .
       dockerfile: Dockerfile
+      args:
+        - GOPROXY=https://proxy.golang.org,direct
     image: codex-pool:latest
     container_name: codex-pool
     restart: unless-stopped