right-size app memory limits via Cloudron API [#685]

Staged during the postgres/connection exhaustion fix; limits had grown to
160GB total on a 62GB box while chasing the flapping. Plan/canary/apply
modes, ~28GB of slider headroom reclaim.

scripts/cloudron-memlimits.sh

@@ -0,0 +1,74 @@
+#!/bin/sh
+# cloudron-memlimits.sh - right-size app memory limits [#685]
+# Reads CLOUDRON_URL + CLOUDRON_TOKEN from ~/.creds/cloudron.env
+# Usage: cloudron-memlimits.sh [canary|apply|plan]
+#   plan   (default) show current vs proposed, change nothing
+#   canary apply axiosheartstudios.com only, then verify
+#   apply  apply all proposals
+set -eu
+
+ENV_FILE="$HOME/.creds/cloudron.env"
+[ -f "$ENV_FILE" ] || { echo "missing $ENV_FILE"; exit 1; }
+. "$ENV_FILE"
+: "${CLOUDRON_URL:?}" "${CLOUDRON_TOKEN:?}"
+
+MODE="${1:-plan}"
+
+# fqdn:new-limit-MB  (from #685 census 2026-09-02, steady-state based)
+PROPOSALS="
+axiosheartstudios.com:512
+community.turnsys.com:4096
+nextcloud.knownelement.com:2048
+bookmarks.knownelement.com:2048
+photos.knownelement.com:3072
+share.knownelement.com:512
+hfnfc.net:512
+notes.knownelement.com:1024
+office-onlyoffice.knownelement.com:1536
+paperless.knownelement.com:2048
+file-transfer.knownelement.com:512
+digital-assets-manager.knownelement.com:512
+pwvault.turnsys.com:512
+finance.turnsys.com:512
+finance.reachableceo.com:512
+cmdb.knownelement.com:512
+"
+
+api() {
+  curl -s -m 30 -H "Authorization: Bearer $CLOUDRON_TOKEN" "$@"
+}
+
+APPS=$(api "$CLOUDRON_URL/api/v1/apps?per_page=200")
+echo "$APPS" | jq -e '.apps' >/dev/null 2>&1 || { echo "API auth/list failed"; exit 1; }
+
+reclaimed=0
+for line in $PROPOSALS; do
+  fqdn=${line%%:*}; newmb=${line##*:}
+  match=$(echo "$APPS" | jq -r --arg f "https://$fqdn" \
+    '.apps[] | select(.fqdn==$f or (.domain==$f and (.location=="" or .location=="@"))) | "\(.id) \(.memoryLimit)"' | head -1)
+  [ -z "$match" ] && { echo "SKIP $fqdn (not an app)"; continue; }
+  appid=${match%% *}; curmb=$(( ${match##* } / 1048576 ))
+  [ "$curmb" -le "$newmb" ] && { echo "SKIP $fqdn (already $curmbMB <= $newmb)"; continue; }
+
+  case "$MODE" in
+    plan)
+      echo "PLAN $fqdn: ${curmb}MB -> ${newmb}MB (reclaim $((curmb - newmb))MB)"
+      ;;
+    canary)
+      [ "$fqdn" != "axiosheartstudios.com" ] && continue
+      echo "CANARY $fqdn: ${curmb}MB -> ${newmb}MB"
+      api -X POST "$CLOUDRON_URL/api/v1/apps/$appid" -H 'Content-Type: application/json' \
+        -d "{\"memoryLimit\": $((newmb * 1048576))}" | jq -r '.status // .message // .'
+      ;;
+    apply)
+      echo "APPLY $fqdn: ${curmb}MB -> ${newmb}MB"
+      api -X POST "$CLOUDRON_URL/api/v1/apps/$appid" -H 'Content-Type: application/json' \
+        -d "{\"memoryLimit\": $((newmb * 1048576))}" | jq -r '.status // .message // .'
+      sleep 8
+      ;;
+  esac
+  reclaimed=$((reclaimed + curmb - newmb))
+done
+
+echo "---"
+echo "mode=$MODE total-limit-reclaim=${reclaimed}MB"