tests(compat): stub torch module in conftest

Add tests/compat/conftest.py to inject a stub torch module into sys.modules when torch is not installed. This prevents ImportError during DLCLive compatibility tests so the API can be validated without requiring torch to be installed. This is a pragmatic workaround and includes a note to remove or replace it once imports are properly guarded in the package.

Author: C-Achard

tests/compat/conftest.py

@@ -0,0 +1,10 @@
+# tests/compat/conftest.py
+import sys
+import types
+
+# Stub out torch imports to avoid ImportError when torch is not installed in DLCLive package.
+# This allows testing of DLCLive API compatibility without requiring torch.
+# Ideally imports should be guarded in the package itself, but this is a pragmatic solution for now.
+# IMPORTANT NOTE: This should ideally be removed and replaced whenever possible.
+if "torch" not in sys.modules:
+    sys.modules["torch"] = types.ModuleType("torch")