refactor: split ServiceCommand methods into dedicated files

- Move ServiceCommand.Start to commands_service_start.go
- Move ServiceCommand.Stop to commands_service_stop.go
- Move ServiceCommand.Restart to commands_service_restart.go
- Move ServiceCommand.Reload to commands_service_reload.go
- Move ServiceCommand.Status to commands_service_status.go
- Move ServiceCommand.Uninstall to commands_service_uninstall.go
- Move createStartCommands to commands_service_start.go
- Clean up imports in commands_service.go
- Remove all method implementations from main service file

This refactoring improves code organization by:
- Separating concerns into focused files
- Making navigation easier for developers
- Reducing merge conflicts between different commands
- Following consistent modular patterns
- Reducing commands_service.go from ~650 lines to ~50 lines

Each method is now co-located with its related functionality,
making the codebase more maintainable and easier to understand.

cmd/cli/commands_service_uninstall.go

@@ -0,0 +1,86 @@
+package cli
+
+import (
+	"net"
+	"os"
+	"path/filepath"
+
+	"github.com/spf13/cobra"
+
+	"github.com/Control-D-Inc/ctrld"
+)
+
+// Uninstall implements the logic from cmdUninstall.Run
+func (sc *ServiceCommand) Uninstall(cmd *cobra.Command, args []string) error {
+	s := sc.serviceManager.svc
+	p := sc.serviceManager.prog
+	readConfig(false)
+	v.Unmarshal(&cfg)
+	p.cfg = &cfg
+	if iface == "" {
+		iface = "auto"
+	}
+	p.preRun()
+	if ir := runningIface(s); ir != nil {
+		p.runningIface = ir.Name
+		p.requiredMultiNICsConfig = ir.All
+	}
+	if err := checkDeactivationPin(s, nil); isCheckDeactivationPinErr(err) {
+		os.Exit(deactivationPinInvalidExitCode)
+	}
+	uninstall(p, s)
+	if cleanup {
+		var files []string
+		// Config file.
+		files = append(files, v.ConfigFileUsed())
+		// Log file and backup log file.
+		// For safety, only process if log file path is absolute.
+		if logFile := normalizeLogFilePath(cfg.Service.LogPath); filepath.IsAbs(logFile) {
+			files = append(files, logFile)
+			oldLogFile := logFile + oldLogSuffix
+			if _, err := os.Stat(oldLogFile); err == nil {
+				files = append(files, oldLogFile)
+			}
+		}
+		// Socket files.
+		if dir, _ := socketDir(); dir != "" {
+			files = append(files, filepath.Join(dir, ctrldControlUnixSock))
+			files = append(files, filepath.Join(dir, ctrldLogUnixSock))
+		}
+		// Static DNS settings files.
+		withEachPhysicalInterfaces("", "", func(i *net.Interface) error {
+			file := ctrld.SavedStaticDnsSettingsFilePath(i)
+			files = append(files, file)
+			return nil
+		})
+		bin, err := os.Executable()
+		if err != nil {
+			mainLog.Load().Warn().Err(err).Msg("failed to get executable path")
+		}
+		if bin != "" && supportedSelfDelete {
+			files = append(files, bin)
+		}
+		// Backup file after upgrading.
+		oldBin := bin + oldBinSuffix
+		if _, err := os.Stat(oldBin); err == nil {
+			files = append(files, oldBin)
+		}
+		for _, file := range files {
+			if file == "" {
+				continue
+			}
+			if err := os.Remove(file); err == nil {
+				mainLog.Load().Notice().Msgf("removed %s", file)
+			}
+		}
+		// Self-delete the ctrld binary if supported
+		if err := selfDeleteExe(); err != nil {
+			mainLog.Load().Warn().Err(err).Msg("failed to delete ctrld binary")
+		} else {
+			if !supportedSelfDelete {
+				mainLog.Load().Debug().Msgf("file removed: %s", bin)
+			}
+		}
+	}
+	return nil
+}