Extension: aggiungi locales/en.default.json (fix ENOENT locales su shopify app deploy)

Node 18-alpine non espone 'crypto' come global dichiarato: la libreria
@shopify/shopify-api getCryptoLib() fa 'crypto?.webcrypto' -> ReferenceError
'crypto is not defined' -> validateAppProxyHmac fallisce -> 400 su ogni richiesta
app proxy. Node 22 (come in dev) espone crypto global -> HMAC ok -> 200.

Diagnosi: log Fly mostravano 'crypto is not defined' prima di ogni 400; verificato
con firma app-proxy calcolata a mano (ora 200 + form recesso).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Mv83a29B4eFv5ixoj6PoE1

app/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:18-alpine
+FROM node:22-alpine
 RUN apk add --no-cache openssl
 
 EXPOSE 3000

app/extensions/recesso-storefront/locales/en.default.json

@@ -0,0 +1 @@
+{}