perf: skip torch import on non-macOS

Author: Algorithm5838

backend/open_webui/env.py

@@ -60,13 +60,14 @@
 else:
     DEVICE_TYPE = 'cpu'
 
-try:
-    import torch
+if sys.platform == 'darwin':
+    try:
+        import torch
 
-    if torch.backends.mps.is_available() and torch.backends.mps.is_built():
-        DEVICE_TYPE = 'mps'
-except Exception:
-    pass
+        if torch.backends.mps.is_available() and torch.backends.mps.is_built():
+            DEVICE_TYPE = 'mps'
+    except Exception:
+        pass
 
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 # LOGGING