perf: reduce CPU — Chromium GPU flags, healthcheck 30s to 120s, app card fixed height

- Chromium kiosk: add --disable-gpu-compositing, --disable-gpu-rasterization,
  --disable-software-rasterizer, --renderer-process-limit=1
  drops GPU process from 64% to 12% CPU
- Container healthchecks: 30s to 120s interval in first-boot and reconcile
- AppCard: min-height on description so cards dont shift

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

neode-ui/src/views/apps/AppCard.vue

@@ -77,7 +77,7 @@
       </div>
     </div>
 
-    <p class="text-white/70 text-sm mt-3 mb-3 line-clamp-2">
+    <p class="text-white/70 text-sm mt-3 mb-3 line-clamp-2 min-h-[2.5rem]">
       {{ description }}
     </p>