fix: resolve shadowing from eslint audit

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

Author: aid-ninja

lib/server.js

@@ -318,23 +318,23 @@ const MIME = {
 // ── Body parser ───────────────────────────────────────────────────────────────
 
 function readBody(req) {
-  return new Promise((resolve, reject) => {
+  return new Promise((res, reject) => {
     const chunks = [];
     let size = 0;
     req.on("data", (chunk) => {
       size += chunk.length;
       if (size > 1048576) {
-        resolve(null);
+        res(null);
         req.destroy();
         return;
       }
       chunks.push(chunk);
     });
     req.on("end", () => {
       try {
-        resolve(JSON.parse(Buffer.concat(chunks).toString()));
+        res(JSON.parse(Buffer.concat(chunks).toString()));
       } catch {
-        resolve(null);
+        res(null);
       }
     });
     req.on("error", reject);