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

systemd/generator_test.go

@@ -49,7 +49,7 @@ func TestGenerate_SystemUnit(t *testing.T) {
 		"After=network.target",
 		"WantedBy=multi-user.target",
 		"ExecStart=/usr/bin/podman start -a nginx",
-		"ExecStop=/usr/bin/podman stop nginx",
+		"ExecStop=-/usr/bin/podman stop nginx",
 		"Generated by unitdore",
 	}
 
@@ -87,8 +87,8 @@ func TestGenerate_UserUnit(t *testing.T) {
 	checks := []string{
 		"After=default.target",
 		"WantedBy=default.target",
-		"ExecStart=/usr/bin/docker start myapp",
-		"ExecStop=/usr/bin/docker stop myapp",
+		"ExecStart=/usr/bin/docker start -a myapp",
+		"ExecStop=-/usr/bin/docker stop myapp",
 	}
 
 	for _, check := range checks {
@@ -178,8 +178,8 @@ func TestGenerate_DockerRuntime(t *testing.T) {
 	}
 
 	checks := []string{
-		"ExecStart=/usr/bin/docker start redis",
-		"ExecStop=/usr/bin/docker stop redis",
+		"ExecStart=/usr/bin/docker start -a redis",
+		"ExecStop=-/usr/bin/docker stop redis",
 		"After=network.target docker.service",
 		"Requires=docker.service",
 	}
@@ -240,7 +240,7 @@ func TestBuildExecCommands(t *testing.T) {
 		{
 			name:      "docker",
 			unit:      config.Unit{Name: "app", Runtime: "docker"},
-			wantStart: "/usr/bin/docker start app",
+			wantStart: "/usr/bin/docker start -a app",
 			wantStop:  "/usr/bin/docker stop app",
 		},
 		{