Clean up all staticcheck errors (SA4006 + U1000): fix dead assignments in server_info.go and build_universal.go; remove unused proxy fields and functions; delete superseded icon_windows.go and shortcut_windows.go

server/internal/api/server_info.go

@@ -3,7 +3,6 @@ package api
 import (
 	"net"
 	"net/http"
-	"net/url"
 	"strings"
 )
 
@@ -38,10 +37,6 @@ func GetServerInfo(w http.ResponseWriter, r *http.Request, publicURLOverride str
 	suggestedURL := "http://" + net.JoinHostPort(suggestedHost, itoa(port))
 	if strings.TrimSpace(publicURLOverride) != "" {
 		suggestedURL = strings.TrimSpace(publicURLOverride)
-		suggestedHost = suggestedURL
-		if u, err := url.Parse(suggestedURL); err == nil && u.Hostname() != "" {
-			suggestedHost = u.Hostname()
-		}
 	}
 	info := ServerInfo{
 		Port:         port,