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/claude-memory/main.tf

@@ -142,7 +142,7 @@ resource "kubernetes_deployment" "claude-memory" {
     }
   }
   spec {
-    replicas = 2
+    replicas = 1
     selector {
       match_labels = {
         app = "claude-memory"