feat(cmd): add installall/uninstallall; fix startall/stopall and service lifecycle

- startall now uses systemctl start (not enable --now)
- stopall now uses systemctl stop (not disable --now)
- add installall command (bulk install with --dry-run support)
- add uninstallall command (bulk disable+remove in reverse order)
- fix docker ExecStart to use -a flag so the process stays attached
- prefix ExecStop with - so a stop-on-already-dead container does not fail the unit

cmd/startall.go

@@ -11,9 +11,9 @@ import (
 
 var startallCmd = &cobra.Command{
 	Use:   "startall",
-	Short: "Enable and start all installed, enabled units",
-	Long: `Startall runs 'systemctl enable --now' for all enabled units that have
-been installed. Units must be installed first via 'unitdore install'.`,
+	Short: "Start all installed, enabled units",
+	Long: `Startall runs 'systemctl start' for all enabled units that have been installed.
+Units must be installed first via 'unitdore installall'.`,
 	RunE: runStartall,
 }
 
@@ -50,7 +50,7 @@ func runStartall(cmd *cobra.Command, args []string) error {
 			continue
 		}
 		fmt.Printf("  ▶ starting: %s...\n", systemd.ServiceName(u, prefix, suffix))
-		if err := systemd.Enable(u, prefix, suffix); err != nil {
+		if err := systemd.Start(u, prefix, suffix); err != nil {
 			fmt.Printf("  ✗ failed: %s: %v\n", u.Name, err)
 			failed++
 		} else {