increase global rate limit from 10/50 to 50/200

HA frontend loads 30-50 JS bundles on page load, exhausting the burst.
iOS Companion app reconnections also trigger bursts. 172 rate-limited
(429) requests found in Traefik logs causing intermittent connectivity
failures for ha-sofia iOS app.

stacks/platform/modules/traefik/middleware.tf

@@ -13,8 +13,8 @@ resource "kubernetes_manifest" "middleware_rate_limit" {
     }
     spec = {
       rateLimit = {
-        average = 10
-        burst   = 50
+        average = 50
+        burst   = 200
       }
     }
   }