feat: order/delay in service files, enable cmd, --all on unit commands

- install/uninstall/start/stop/enable take <name> or --all; *all kept as shortcuts
- add enable (enable at boot + start); startall no longer enables
- order/delay resolved by config.ResolveOrder and written into systemd,
  OpenRC and runit service files (After=/sleep), so they apply at boot
- install --all stops and disables units before removing their files
- update regenerates all installed, enabled units and removes disabled ones
- edit creates the config dir; docs and man page updated
- tests: fake Init for cmd, ResolveOrder, backend ordering output

cmd/list.go

@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"fmt"
-	"sort"
 	"strings"
 
 	"github.com/spf13/cobra"
@@ -31,14 +30,7 @@ func runList(cmd *cobra.Command, args []string) error {
 		return nil
 	}
 
-	units := make([]config.Unit, len(cfg.Units))
-	copy(units, cfg.Units)
-	sort.Slice(units, func(i, j int) bool {
-		if units[i].Order != units[j].Order {
-			return units[i].Order < units[j].Order
-		}
-		return units[i].Name < units[j].Name
-	})
+	units := sortUnits(cfg.Units, false)
 
 	prefix, suffix := cfg.Prefix, cfg.Suffix
 	ini, err := initsys.New(cfg)