chore: remove deprecated build tags and use strings.ReplaceAll

- Remove redundant // +build directives (go:build is sufficient in Go 1.17+)
- Replace strings.Replace(..., -1) with strings.ReplaceAll

cmd/pulse-host-agent/service_stub.go

@@ -1,5 +1,4 @@
 //go:build !windows
-// +build !windows
 
 package main
 

cmd/pulse-host-agent/service_windows.go

@@ -1,5 +1,4 @@
 //go:build windows
-// +build windows
 
 package main
 

internal/api/config_handlers.go

@@ -6007,7 +6007,7 @@ func (h *ConfigHandlers) handleSecureAutoRegister(w http.ResponseWriter, _ *http
 	// Generate a unique token name based on Pulse's IP/hostname
 	hostname, _ := os.Hostname()
 	if hostname == "" {
-		hostname = strings.Replace(clientIP, ".", "-", -1)
+		hostname = strings.ReplaceAll(clientIP, ".", "-")
 	}
 	timestamp := time.Now().Unix()
 	tokenName := fmt.Sprintf("pulse-%s-%d", hostname, timestamp)