fix: update torch dependency to support platform-specific installation

Author: liuruibin

pyproject.toml

@@ -37,7 +37,10 @@ langchain-mcp-adapters = "0.1.9"
 langchain-huggingface = "0.3.0"
 langchain-ollama = "0.3.4"
 langgraph = "0.5.3"
-torch = {version = "2.8.0+cpu", source = "pytorch"}
+torch = [
+    { version = "2.8.0+cpu", markers = "sys_platform == 'linux'", source = "pytorch" },
+    { url = "https://download.pytorch.org/whl/cpu/torch-2.8.0-cp311-none-macosx_11_0_arm64.whl", markers = "sys_platform == 'darwin'" }
+]
 sentence-transformers = "5.0.0"
 
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