fix: remove func call from alternative value.

this avoid useless allocation or non-trivial work, if the default value
is not needed/used.

add a line in Cargo.toml to easly enable or_fun_call lint
help: https://rust-lang.github.io/rust-clippy/master/index.html?search=or_fun_call

src/api/k2v/router.rs

@@ -62,7 +62,7 @@ impl Endpoint {
 		let (bucket, partition_key) = path
 			.split_once('/')
 			.map(|(b, p)| (b.to_owned(), p.trim_start_matches('/')))
-			.unwrap_or((path.to_owned(), ""));
+			.unwrap_or_else(|| (path.to_owned(), ""));
 
 		if bucket.is_empty() {
 			return Err(Error::bad_request("Missing bucket name"));