fix: rybbit init port, mysql memory limit, metallb alert selector

- rybbit-client: fix Kyverno wait-for port 3001 → 80 (service port, not targetPort)
- dbaas: increase MySQL memory limit 4Gi → 5Gi (mysql-cluster-1 at 95.9%)
- dbaas: bump ResourceQuota limits.memory 24Gi → 27Gi to accommodate
- monitoring: fix MetalLBControllerDown alert selector for v0.15 (controller → metallb-controller)

stacks/rybbit/main.tf

@@ -433,7 +433,7 @@ resource "kubernetes_deployment" "rybbit-client" {
           app = "rybbit-client"
         }
         annotations = {
-          "dependency.kyverno.io/wait-for" = "rybbit.rybbit:3001"
+          "dependency.kyverno.io/wait-for" = "rybbit.rybbit:80"
         }
       }
       spec {