feat(platform): wire OTP SMS env from platform Secret via Helm

Enable backend.sms in the chart so MizbanSMS credentials from the platform
Secret are injected into the backend deployment for production OTP delivery.

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

gitops/platform/values-abrban.example.yaml

@@ -112,6 +112,13 @@ backend:
     KIBANA_SYSTEM_PASSWORD: "CHANGE_VIA_SEALEDSECRET_OR_KUBECTL"
     # Swagger disabled in production unless explicitly enabled
     # SWAGGER_ENABLED: "true"
+  # OTP SMS — username/password in abrban-platform-secrets (SealedSecret).
+  sms:
+    enabled: true
+    provider: mizbansms
+    from: "5000467254"
+    api: "2016"
+    userType: "2"
 
 frontend:
   enabled: true