equalize memory req=lim across 70+ containers using Prometheus 7d max data

After node2 OOM incident, right-size memory across the cluster by setting
requests=limits based on max_over_time(container_memory_working_set_bytes[7d])
with 1.3x headroom. Eliminates ~37Gi overcommit gap.

Categories:
- Safe equalization (50 containers): set req=lim where max7d well within target
- Limit increases (8 containers): raise limits for services spiking above current
- No Prometheus data (12 containers): conservatively set lim=req
- Exception: nextcloud keeps req=256Mi/lim=8Gi due to Apache memory spikes

Also increased dbaas namespace quota from 12Gi to 16Gi to accommodate mysql
4Gi limits across 3 replicas.

stacks/platform/modules/iscsi-csi/main.tf

@@ -38,8 +38,8 @@ resource "helm_release" "democratic_csi" {
       replicas = 2
       driver = {
         resources = {
-          requests = { cpu = "25m", memory = "64Mi" }
-          limits   = { memory = "256Mi" }
+          requests = { cpu = "25m", memory = "192Mi" }
+          limits   = { memory = "192Mi" }
         }
       }
     }
@@ -47,8 +47,8 @@ resource "helm_release" "democratic_csi" {
     node = {
       driver = {
         resources = {
-          requests = { cpu = "25m", memory = "64Mi" }
-          limits   = { memory = "256Mi" }
+          requests = { cpu = "25m", memory = "192Mi" }
+          limits   = { memory = "192Mi" }
         }
       }