fix: enable forwarded headers in nginx ingress for HTTPS detection

Laravel was generating HTTP URLs instead of HTTPS because nginx ingress
wasn't properly forwarding the X-Forwarded-Proto header.

Added nginx.ingress.kubernetes.io/use-forwarded-headers annotation to
ensure the ingress controller sends X-Forwarded-* headers to Laravel.

This fixes mixed content errors where cart and other AJAX requests were
being blocked by the browser.

k8s/base/ingress.yaml

@@ -7,6 +7,7 @@ metadata:
     cert-manager.io/cluster-issuer: "letsencrypt-prod"
     nginx.ingress.kubernetes.io/proxy-body-size: "50m"
     nginx.ingress.kubernetes.io/ssl-redirect: "true"
+    nginx.ingress.kubernetes.io/use-forwarded-headers: "true"
     # WebSocket support for Reverb
     nginx.ingress.kubernetes.io/proxy-read-timeout: "3600"
     nginx.ingress.kubernetes.io/proxy-send-timeout: "3600"