chore: remove Open Food Facts (OFF) integration

- Remove off-service.js and off-service.test.js
- Remove OFF import from server.js
- Simplify /api/products/search to only use CIMA
- Remove 'openfoodfacts' from valid product sources
- Update frontend-mobile Product interface to remove OFF source
- Remove OFF env vars from .env.example
- Add PARAPHARMACY_API_URL to .env.example

OFF was replaced by the new parapharmacy-api microservice.

apps/frontend-mobile/services/products.ts

@@ -3,7 +3,7 @@ import api from './api';
 export interface Product {
   id: string;
   _id?: string;
-  source: 'cima' | 'openfoodfacts' | 'promofarma' | 'pharmarket' | 'docmorris' | '1001farma' | 'primor' | 'mifarma';
+  source: 'cima' | 'promofarma' | 'pharmarket' | 'docmorris' | '1001farma' | 'primor' | 'mifarma';
   name: string;
   brand: string;
   category: string;
@@ -22,10 +22,6 @@ export interface Product {
   commercialized?: boolean;
   photos?: { tipo: string; url: string }[];
   docs?: { tipo: number; url: string }[];
-  nutriscore?: string;
-  ingredients?: string;
-  nova_group?: number;
-  eco_score?: string;
 }
 
 export interface ProductSearchResponse {
@@ -35,7 +31,6 @@ export interface ProductSearchResponse {
   pages?: number;
   sources?: {
     cima: number;
-    openfoodfacts: number;
   };
 }