Fix frontend staging healthcheck for locale redirect

Accept 2xx/3xx on / so next-intl redirect to /en no longer marks the
container unhealthy and blocks nginx from starting.

Co-authored-by: Cursor <cursoragent@cursor.com>

infrastructure/STAGING-DEPLOY.md

@@ -250,7 +250,7 @@ On the Windows host, from repo `infrastructure/`:
 | Backend restart loop | JWT secrets still placeholder; fix `backend.staging.env` |
 | Backend DB auth error | `DATABASE_URL` password ≠ `POSTGRES_PASSWORD` |
 | `dumb-init docker-entrypoint.sh: No such file or directory` | Windows CRLF in shell scripts — fixed in Dockerfiles (rebuild images). |
-| `nginx: host not found in upstream "backend:3000"` | Backend/frontend not running yet — fix entrypoint/env first; nginx config uses Docker DNS resolver. |
+| `frontend is unhealthy` / deploy waits on frontend | Next.js `/` redirects to `/en` (3xx). Rebuild after healthcheck fix (accepts 2xx/3xx). |
 
 **Logs:**
 

infrastructure/docker-compose.registry.yml

@@ -75,7 +75,8 @@ services:
       - dyolink_staging
     restart: unless-stopped
     healthcheck:
-      test: ["CMD", "node", "-e", "require('http').get('http://127.0.0.1:3000/', (r) => {if(r.statusCode!==200)process.exit(1)})"]
+      # Root redirects to /en (next-intl) — accept 2xx/3xx as healthy.
+      test: ["CMD", "node", "-e", "require('http').get('http://127.0.0.1:3000/', (r) => { process.exit(r.statusCode >= 200 && r.statusCode < 400 ? 0 : 1); }).on('error', () => process.exit(1))"]
       interval: 30s
       timeout: 10s
       retries: 3

infrastructure/docker-compose.staging.yml

@@ -77,7 +77,8 @@ services:
       - dyolink_staging
     restart: unless-stopped
     healthcheck:
-      test: ["CMD", "node", "-e", "require('http').get('http://127.0.0.1:3000/', (r) => {if(r.statusCode!==200)process.exit(1)})"]
+      # Root redirects to /en (next-intl) — accept 2xx/3xx as healthy.
+      test: ["CMD", "node", "-e", "require('http').get('http://127.0.0.1:3000/', (r) => { process.exit(r.statusCode >= 200 && r.statusCode < 400 ? 0 : 1); }).on('error', () => process.exit(1))"]
       interval: 30s
       timeout: 10s
       retries: 3