Use portable USearch on macOS.

crates/bds-core/Cargo.toml

@@ -45,9 +45,14 @@ url = { workspace = true }
 base64 = { workspace = true }
 dirs = { workspace = true }
 fastembed = { workspace = true }
-usearch = { workspace = true }
 ort = { workspace = true }
 
+[target.'cfg(target_os = "macos")'.dependencies]
+usearch = { workspace = true }
+
+[target.'cfg(not(target_os = "macos"))'.dependencies]
+usearch = { workspace = true, features = ["numkong"] }
+
 [dev-dependencies]
 tempfile = "3"