refactor(core): remove hotpath profiling (#2394)

hotpath adds noticeable overhead on hot paths, so remove the optional
profiling integration while keeping direct quanta::Instant timing.

easytier/src/proto/rpc_impl/client.rs

@@ -5,8 +5,8 @@ use std::sync::{Arc, Mutex};
 use bytes::Bytes;
 use dashmap::DashMap;
 use guarden::defer;
-use hotpath::instant::Instant;
 use prost::Message;
+use quanta::Instant;
 use tokio::sync::mpsc;
 use tokio::task::JoinSet;
 use tokio::time::timeout;

easytier/src/proto/rpc_impl/packet.rs

@@ -1,6 +1,6 @@
 use prost::{Message as _, length_delimiter_len};
 
-use hotpath::instant::Instant;
+use quanta::Instant;
 
 use crate::{
     common::{PeerId, compressor::DefaultCompressor},

easytier/src/proto/rpc_impl/server.rs

@@ -5,8 +5,8 @@ use std::{
 
 use bytes::Bytes;
 use dashmap::DashMap;
-use hotpath::instant::Instant;
 use prost::Message;
+use quanta::Instant;
 use tokio::{task::JoinSet, time::timeout};
 use tokio_stream::StreamExt;