refactor(agent): remove goutils/server dependency and use direct HTTP server setup

- Replaced `goutils/server` helper library with manual HTTP server configuration for agent socketproxy
- Removed entire `agent/pkg/server/server.go` package (43 lines) that wrapped TLS/HTTP server functionality
- Added explicit TCP listener and integrated zerolog with server's error logging
- Cleaned up 17 unused indirect agent dependencies

agent/pkg/server/server.go

@@ -1,43 +0,0 @@
-package server
-
-import (
-	"crypto/tls"
-	"crypto/x509"
-	"fmt"
-	"net/http"
-
-	"github.com/rs/zerolog/log"
-	"github.com/yusing/godoxy/agent/pkg/env"
-	"github.com/yusing/godoxy/agent/pkg/handler"
-	"github.com/yusing/goutils/server"
-	"github.com/yusing/goutils/task"
-)
-
-type Options struct {
-	CACert, ServerCert *tls.Certificate
-	Port               int
-}
-
-func StartAgentServer(parent task.Parent, opt Options) {
-	caCertPool := x509.NewCertPool()
-	caCertPool.AddCert(opt.CACert.Leaf)
-
-	// Configure TLS
-	tlsConfig := &tls.Config{
-		Certificates: []tls.Certificate{*opt.ServerCert},
-		ClientCAs:    caCertPool,
-		ClientAuth:   tls.RequireAndVerifyClientCert,
-	}
-
-	if env.AgentSkipClientCertCheck {
-		tlsConfig.ClientAuth = tls.NoClientCert
-	}
-
-	agentServer := &http.Server{
-		Addr:      fmt.Sprintf(":%d", opt.Port),
-		Handler:   handler.NewAgentHandler(),
-		TLSConfig: tlsConfig,
-	}
-
-	server.Start(parent.Subtask("agent-server", false), agentServer, server.WithLogger(&log.Logger))
-}