bump memory limits for OOM-prone services

FreshRSS: 64Mi → 256Mi (171 restarts, VPA upper ~204Mi)
Actual Budget HTTP API: 128Mi → 384Mi (17 restarts, VPA upper ~297Mi)
n8n: 768Mi → 1Gi (18 restarts, VPA upper ~765Mi)
Dawarich: 768Mi → 896Mi (2 restarts, VPA upper ~628Mi)
Traefik: 384Mi → 768Mi (2 restarts, VPA upper ~584Mi)

stacks/traefik/modules/traefik/main.tf

@@ -201,10 +201,10 @@ resource "helm_release" "traefik" {
     resources = {
       requests = {
         cpu    = "100m"
-        memory = "384Mi"
+        memory = "768Mi"
       }
       limits = {
-        memory = "384Mi"
+        memory = "768Mi"
       }
     }