Fix LibreTranslate deploy: healthcheck from PHP container, ignore_errors, add QR code tests

- Ansible: healthcheck via PHP container (curl from php, not libretranslate)
- Ansible: exit 0 if LibreTranslate not ready (don't block deploy)
- Ansible: ignore_errors on translation step (non-blocking)
- AccountControllerTest: add testEventQrCode (PNG response) and testEventQrCodeDeniedForOtherUser (403)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ansible/deploy.yml

@@ -138,10 +138,11 @@
     - name: Wait for LibreTranslate to be healthy
       shell: |
         for i in $(seq 1 60); do
-          docker compose -f docker-compose-prod.yml exec -T libretranslate curl -sf http://localhost:5000/languages >/dev/null 2>&1 && exit 0
+          docker compose -f docker-compose-prod.yml exec -T php curl -sf http://libretranslate:5000/languages >/dev/null 2>&1 && exit 0
           sleep 5
         done
-        exit 1
+        echo "LibreTranslate not ready after 5 minutes, skipping translation"
+        exit 0
       args:
         chdir: /var/www/e-ticket
 
@@ -149,6 +150,7 @@
       command: make trans_prod
       args:
         chdir: /var/www/e-ticket
+      ignore_errors: true
 
     - name: Ensure uploads directories exist with correct permissions
       file: