scale down non-critical services to free cluster memory

- authentik server: 3→2, worker: 3→2, PDB minAvailable: 2→1
- tuya-bridge: 3→1
- realestate-crawler-api: 2→1
- claude-memory: 2→1
- grafana: 2→1 (config only, apply pending)
- alertmanager: 2→1 (config only, apply pending)

Estimated savings: ~1.2 Gi total

stacks/tuya-bridge/main.tf

@@ -59,7 +59,7 @@ resource "kubernetes_deployment" "tuya-bridge" {
     }
   }
   spec {
-    replicas = 3
+    replicas = 1
     selector {
       match_labels = {
         app = "tuya-bridge"