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>

load-tests/api.js

@@ -2,7 +2,7 @@
 /**
  * Load test for `apps/api` — the unified Hono/Bun API server that hosts
  * all 16 product compute modules (calendar, todo, chat, picture, planta,
- * nutriphi, news, traces, moodlit, presi, music, contacts, storage,
+ * food, news, traces, moodlit, presi, music, contacts, storage,
  * context, guides, research) on a single port.
  *
  * Why this script exists

load-tests/web-apps.js

@@ -20,7 +20,7 @@ const apps = [
 	{ name: 'storage', url: `${BASE}:5178` },
 	{ name: 'presi', url: `${BASE}:5180` },
 	{ name: 'cards', url: `${BASE}:5181` },
-	{ name: 'nutriphi', url: `${BASE}:5182` },
+	{ name: 'food', url: `${BASE}:5182` },
 	{ name: 'skilltree', url: `${BASE}:5183` },
 	{ name: 'photos', url: `${BASE}:5184` },
 	{ name: 'music', url: `${BASE}:5189` },