refactor: rename nutriphi module to food (Essen)

Complete rename across the entire monorepo pre-launch:
- Module, routes, API, i18n, standalone landing app directories
- All code identifiers, display names, logo component
- German user-facing label: "Essen" (English brand stays "Food")
- Dexie table nutriFavorites -> foodFavorites
- Infra configs (docker-compose, cloudflared, nginx, wrangler)

Zero residue of nutriphi remains. No data migration needed (pre-launch).

Follow-up: run pnpm install, update Cloudflare DNS
(food.mana.how), rename Cloudflare Pages project.

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

services/mana-auth/src/services/user-data.ts

@@ -121,7 +121,7 @@ const PROJECT_META: Record<string, { name: string; icon: string }> = {
 	zitare: { name: 'Zitare', icon: '✨' },
 	presi: { name: 'Presi', icon: '📊' },
 	inventory: { name: 'Inventar', icon: '📦' },
-	nutriphi: { name: 'Nutriphi', icon: '🥗' },
+	food: { name: 'Food', icon: '🥗' },
 	plants: { name: 'Plants', icon: '🌱' },
 	storage: { name: 'Storage', icon: '☁️' },
 	questions: { name: 'Questions', icon: '❓' },