feat(socket-proxy): implement Docker socket proxy and related configurations

- Updated Dockerfile and Makefile for socket-proxy build.
- Modified go.mod to include necessary dependencies.
- Updated CI workflows for socket-proxy integration.
- Better module isolation
- Code refactor

internal/net/gphttp/httpheaders/websocket.go

@@ -4,18 +4,6 @@ import (
 	"net/http"
 )
 
-const (
-	HeaderXGoDoxyWebsocketAllowedDomains = "X-GoDoxy-Websocket-Allowed-Domains"
-)
-
-func WebsocketAllowedDomains(h http.Header) []string {
-	return h[HeaderXGoDoxyWebsocketAllowedDomains]
-}
-
-func SetWebsocketAllowedDomains(h http.Header, domains []string) {
-	h[HeaderXGoDoxyWebsocketAllowedDomains] = domains
-}
-
 func IsWebsocket(h http.Header) bool {
 	return UpgradeType(h) == "websocket"
 }