Remove the rate limit for the forward auth system

app/controllers/api/forward_auth_controller.rb

@@ -3,7 +3,7 @@ module Api
     # ForwardAuth endpoints need session storage for return URL
     allow_unauthenticated_access
     skip_before_action :verify_authenticity_token
-    rate_limit to: 100, within: 1.minute, only: :verify, with: -> { head :too_many_requests }
+    # No rate limiting on forward_auth endpoint - proxy middleware hits this frequently
 
     # GET /api/verify
     # This endpoint is called by reverse proxies (Traefik, Caddy, nginx)