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/real-estate-crawler/main.tf

@@ -192,7 +192,7 @@ resource "kubernetes_deployment" "realestate-crawler-api" {
     }
   }
   spec {
-    replicas = 2
+    replicas = 1
     strategy {
       type = "RollingUpdate"
       rolling_update {