admin api: new router_v2 with unified path syntax

src/api/k2v/api_server.rs

@@ -1,3 +1,4 @@
+use std::borrow::Cow;
 use std::sync::Arc;
 
 use async_trait::async_trait;
@@ -181,8 +182,8 @@ impl ApiHandler for K2VApiServer {
 }
 
 impl ApiEndpoint for K2VApiEndpoint {
-	fn name(&self) -> &'static str {
-		self.endpoint.name()
+	fn name(&self) -> Cow<'_, str> {
+		Cow::borrowed(self.endpoint.name())
 	}
 
 	fn add_span_attributes(&self, span: SpanRef<'_>) {