Fix checking cuda at import time

wan/modules/t5.py

@@ -535,13 +535,19 @@ class T5EncoderModel:
         self,
         text_len,
         dtype=torch.bfloat16,
-        device=torch.cuda.current_device(),
+        device=None,
         checkpoint_path=None,
         tokenizer_path=None,
         shard_fn=None,
     ):
         self.text_len = text_len
         self.dtype = dtype
+        # Defer CUDA device access until GPU is available (for ZeroGPU compatibility)
+        if device is None:
+            if torch.cuda.is_available():
+                device = torch.cuda.current_device()
+            else:
+                device = torch.device("cpu")
         self.device = device
         self.checkpoint_path = checkpoint_path
         self.tokenizer_path = tokenizer_path