feat: add "round off this day" nutrition suggestions

Suggest optimal 1-3 food combinations to fill remaining macro budget using
weighted least-squares solver over a curated pantry (~55 foods) plus user
favorites/recents. Recipes scored individually (no combining). Features:

- Combinatorial solver (singles, pairs, triples) with macro-weighted scoring
- MealTypePicker component (extracted from quick-log, shared)
- Hero card with fit%, macro delta icons (Beef/Droplet/Wheat), ingredient
  cards, animated +/X toggle for logging
- Responsive layout: sidebar on mobile, center column on desktop
- MongoDB cache with ±5% tolerance, SSR on cache hit, TTL auto-expiry
- Cache invalidation on food-log/favorites/custom-meals CRUD
- Recipe per100g backfill admin endpoint

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.20.0",
+	"version": "1.21.0",
 	"private": true,
 	"type": "module",
 	"scripts": {