refactor: apply zero-unwrap policy and optimize locks in store.rs and handlers

linux-nvim/tests/integration_test.rs

@@ -1,3 +1,5 @@
+#![cfg(unix)]
+
 use serde_json::{json, Value};
 use std::io::{BufRead, BufReader, Read, Write};
 use std::process::{Command, Stdio};