(#1011) Increase prod ingress max body size to 10m (#1012)

* (#1011) Increase prod ingress max body size to 10m
Missing proxy-body-size annotation caused nginx to use its default 1m
limit, rejecting large publish payloads (~3.4MB) with 413 errors.
Matches the limit already set in sandbox and staging.

Author: arielr-lt

terraform/environments/eks/k8s-manifests-prod/app-ingress.yaml

@@ -3,6 +3,8 @@ kind: Ingress
 metadata:
   name: main-app
   namespace: credreg-prod
+  annotations:
+    nginx.ingress.kubernetes.io/proxy-body-size: "10m"
 spec:
   ingressClassName: nginx
   tls: