Add total and free ram to /system_stats.

Author: comfyanonymous

server.py

@@ -490,12 +490,17 @@ async def view_metadata(request):
         async def system_stats(request):
             device = comfy.model_management.get_torch_device()
             device_name = comfy.model_management.get_torch_device_name(device)
+            cpu_device = comfy.model_management.torch.device("cpu")
+            ram_total = comfy.model_management.get_total_memory(cpu_device)
+            ram_free = comfy.model_management.get_free_memory(cpu_device)
             vram_total, torch_vram_total = comfy.model_management.get_total_memory(device, torch_total_too=True)
             vram_free, torch_vram_free = comfy.model_management.get_free_memory(device, torch_free_too=True)
 
             system_stats = {
                 "system": {
                     "os": os.name,
+                    "ram_total": ram_total,
+                    "ram_free": ram_free,
                     "comfyui_version": get_comfyui_version(),
                     "python_version": sys.version,
                     "pytorch_version": comfy.model_management.torch_version,