fix: drafts page uses server-side API routes (no NEXT_PUBLIC needed)

lib/engine.js

@@ -1,6 +1,8 @@
 const ENGINE_URL = process.env.ENGINE_URL || 'http://127.0.0.1:3040';
 const ENGINE_SECRET = process.env.ENGINE_SECRET || 'zeropost_internal_2026';
 
+export async function engineFetch(path, options = {}) { return call(path, options); }
+
 async function call(path, options = {}) {
   const res = await fetch(`${ENGINE_URL}${path}`, {
     ...options,