health: fix middleware ref namespace prefix (restore site from 404)

My previous commit referenced the new limiter as `health-rate-limit@kubernetescrd`,
omitting the namespace prefix. Traefik CRD middleware refs are
`<namespace>-<name>@kubernetescrd`, and the Middleware lives in the `traefik` ns,
so the router couldn't resolve it — Traefik failed the whole
health.viktorbarzin.me router and returned 404 on every path (the app + pod were
healthy throughout; verified via port-forward).

Correct it to `traefik-health-rate-limit@kubernetescrd`, matching the working
traefik-tripit-rate-limit / traefik-actualbudget-rate-limit references.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

stacks/health/main.tf

@@ -209,8 +209,12 @@ module "ingress" {
   # The redesigned SPA bursts well past the default 10/50 limiter on each page
   # load (shell + fonts + a 5-8 call API burst). Swap the shared limiter for a
   # health-specific one (100/1000), mirroring tripit/immich/actualbudget.
+  # The ref MUST carry the middleware's namespace prefix: the CRD lives in the
+  # `traefik` ns, so it's `traefik-health-rate-limit@kubernetescrd` (same form as
+  # traefik-tripit-rate-limit). Without the prefix Traefik can't resolve it and
+  # 404s the whole router.
   skip_default_rate_limit = true
-  extra_middlewares       = ["health-rate-limit@kubernetescrd"]
+  extra_middlewares       = ["traefik-health-rate-limit@kubernetescrd"]
   extra_annotations = {
     "gethomepage.dev/enabled"      = "true"
     "gethomepage.dev/name"         = "Health"