all: apply golangci-lint 2.9.0 fixes

Fix issues found by the upgraded golangci-lint:
- wsl_v5: add required whitespace in CLI files
- staticcheck SA4006: replace new(var.Field) with &localVar
  pattern since staticcheck does not recognize Go 1.26
  new(value) as a use of the variable
- staticcheck SA5011: use t.Fatal instead of t.Error for
  nil guard checks so execution stops
- unused: remove dead ptrTo helper function

cmd/headscale/cli/api_key.go

@@ -71,6 +71,7 @@ var listAPIKeys = &cobra.Command{
 		tableData := pterm.TableData{
 			{"ID", "Prefix", "Expiration", "Created"},
 		}
+
 		for _, key := range response.GetApiKeys() {
 			expiration := "-"
 
@@ -84,8 +85,8 @@ var listAPIKeys = &cobra.Command{
 				expiration,
 				key.GetCreatedAt().AsTime().Format(HeadscaleDateTimeFormat),
 			})
-
 		}
+
 		err = pterm.DefaultTable.WithHasHeader().WithData(tableData).Render()
 		if err != nil {
 			ErrorOutput(