fix(zero): defensive fetch — don't crash Server Components on engine errors

- autogen page.js: wrap engineCall in try/catch (return null on any failure)
- /zero page: use Promise.allSettled so one failed source doesn't break page

Root cause was ENGINE_URL=host.docker.internal not resolving in coolify net,
fixed at env level but defending code too so future quirks degrade gracefully.

app/zero/page.js

@@ -11,10 +11,13 @@ export const metadata = {
 };
 
 export default async function ZeroPage() {
-  const [notes, character] = await Promise.all([
+  // defensive: один битый источник не должен валить страницу
+  const results = await Promise.allSettled([
     listZeroNotes({ limit: 100 }),
     getZeroCharacter(),
   ]);
+  const notes     = results[0].status === 'fulfilled' ? results[0].value : [];
+  const character = results[1].status === 'fulfilled' ? results[1].value : null;
 
   return (
     <>