refactor: set slog global logger, distinguish root from main logger, linux from windows logger

internal/service/linux.go

@@ -26,7 +26,7 @@ type linuxService struct {
 // NewService creates a new Linux service instance
 func NewService(logger *slog.Logger) Service {
 	return &linuxService{
-		logger: logger,
+		logger: logger.With("type", "service", "variant", "linux"),
 		app:    app.NewApp(logger),
 	}
 }

internal/service/windows.go

@@ -25,7 +25,7 @@ type WindowsService struct {
 func NewService(logger *slog.Logger) Service {
 	return &WindowsService{
 		logger: logger,
-		app:    app.NewApp(logger),
+		app:    app.NewApp(logger.With("service", "windows")),
 	}
 }