feat: add reusable proxy configuration

internal/platform/browser/launch.go

@@ -5,8 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"io/fs"
-	"net"
-	"net/url"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -92,10 +90,7 @@ func BuildArgs(spec domain.LaunchSpec) ([]string, error) {
 	if err != nil {
 		return nil, err
 	}
-	proxy, err := normalizeProxy(normalized.ProxyServer)
-	if err != nil {
-		return nil, err
-	}
+	proxy := normalized.ProxyServer
 	args := []string{
 		"--user-data-dir=" + normalized.UserDataDir,
 		"--no-first-run",
@@ -128,26 +123,6 @@ func BuildArgs(spec domain.LaunchSpec) ([]string, error) {
 	return args, nil
 }
 
-func normalizeProxy(value string) (string, error) {
-	proxy := strings.TrimSpace(value)
-	if proxy == "" {
-		return "", nil
-	}
-	parsed, err := url.Parse(proxy)
-	if err != nil || parsed.User != nil || parsed.Hostname() == "" || parsed.Port() == "" || parsed.Path != "" || parsed.RawQuery != "" || parsed.Fragment != "" {
-		return "", fmt.Errorf("%w: proxy must be scheme://host:port without credentials", domain.ErrInvalidLaunchSpec)
-	}
-	scheme := strings.ToLower(parsed.Scheme)
-	if scheme != "http" && scheme != "https" && scheme != "socks4" && scheme != "socks5" {
-		return "", fmt.Errorf("%w: unsupported proxy scheme", domain.ErrInvalidLaunchSpec)
-	}
-	port, err := strconv.Atoi(parsed.Port())
-	if err != nil || port < 1 || port > 65535 {
-		return "", fmt.Errorf("%w: proxy port out of range", domain.ErrInvalidLaunchSpec)
-	}
-	return scheme + "://" + net.JoinHostPort(strings.ToLower(parsed.Hostname()), strconv.Itoa(port)), nil
-}
-
 func validateExtraArg(value string) error {
 	arg := strings.TrimSpace(value)
 	if arg == "" || !strings.HasPrefix(arg, "--") {