[Rust] Rename mem-cache to sglang-radix-tree (#37290)

python/setup.py

@@ -148,8 +148,8 @@ def _discovered_rust_extensions():
             cargo_manifest_args=["--locked"],
         )
         # Preserve Cargo metadata until the selected extension is actually
-        # built. Alternate platform pyprojects filter mem-cache out before
-        # this point and therefore do not need torch as a build dependency.
+        # built. Alternate platform pyprojects filter the Rust TreeCore extension
+        # out before this point and therefore do not need torch as a build dependency.
         extension._sglang_metadata = sglang_meta
         extension._sglang_manifest_path = package["manifest_path"]
         extensions.append(extension)

python/sglang/srt/mem_cache/rust_tree_core/extension.py

@@ -10,7 +10,7 @@ from sglang.srt.rust_extensions.torch_build import torch_build_configuration
 
 _PYTHON_MODULE = "sglang.srt.mem_cache.rust_tree_core.mem_cache"
 _INSPECTION_MODULE = "sglang.srt.mem_cache.rust_tree_core.mem_cache_inspection"
-_CRATE_DIR = Path(__file__).resolve().parents[5] / "rust" / "mem-cache"
+_CRATE_DIR = Path(__file__).resolve().parents[5] / "rust" / "sglang-radix-tree"
 _TORCH_COMPAT_HEADER = _CRATE_DIR / "torch_2_13_compat.h"