feat(all): configure proxies, reuse native HTTP and stabilize recovery

Persist direct/manual proxy settings in Client Studio and apply them to resource,
Unity and native requests, with loopback bypass and no automatic system proxy.
Pool WinHTTP/curl connections, bound workers and deadlines, cancel safely,
and log queue and transport timings without exposing sensitive paths.
Return explicit relay failures, probe through native HTTP, retry interrupted
requests and recognize completed home, field and pack scenes during recovery.

go/internal/client/app/platform_darwin.go

@@ -3,7 +3,6 @@
 package app
 
 import (
-	"errors"
 	"fmt"
 	"os"
 	"os/exec"
@@ -17,7 +16,7 @@ func ShowFatalError(err error) {
 	}
 }
 
-func launchGame(target string) error {
+func launchGame(target, proxyURL string) error {
 	info, err := os.Stat(target)
 	if err != nil || !info.IsDir() || !strings.EqualFold(filepath.Ext(target), ".app") {
 		return fmt.Errorf("invalid macOS application bundle %q", target)
@@ -27,14 +26,6 @@ func launchGame(target string) error {
 	}
 	// LaunchServices does not inherit open's environment; --env explicitly
 	// supplies the Unity variables to the newly launched application.
-	args := []string{target}
-	for _, entry := range gameProxyEnvironment(os.Environ(), systemGameProxy()) {
-		key, _, found := strings.Cut(entry, "=")
-		if found && (strings.EqualFold(key, "UNITY_PROXYSERVER") || strings.EqualFold(key, "UNITY_NOPROXY")) {
-			args = append(args, "--env", entry)
-		}
-	}
-	args = append(args, "--args")
-	args = append(args, gameLaunchArguments()...)
+	args := gameOpenArguments(target, os.Environ(), proxyURL)
 	return exec.Command("open", args...).Start()
 }