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>

apps/docs/src/content/docs/architecture/storage.mdx

@@ -37,7 +37,7 @@ open http://localhost:9001
 | `picture-storage` | Picture | AI-generated images |
 | `chat-storage` | Chat | User file uploads |
 | `cards-storage` | Cards | Card/deck assets |
-| `nutriphi-storage` | NutriPhi | Meal photos |
+| `food-storage` | Food | Meal photos |
 | `contacts-storage` | Contacts | Contact avatars |
 | `calendar-storage` | Calendar | Event attachments |