fix(ops): Proxmox SSH user for pool clear; optional preflight RPC override

- clear-all-transaction-pools: use PROXMOX_SSH_USER (never root@pam for SSH);
  align R630 host with ip-addresses PROXMOX_R630_01; document post-clear RPC delay
- preflight-chain138-deploy: CHAIN138_PREFLIGHT_RPC_URL for nonce/RPC checks when
  Core 2101 is restarting (e.g. after pool clear) but public RPC is up

Made-with: Cursor

scripts/deployment/preflight-chain138-deploy.sh

@@ -4,6 +4,8 @@
 #
 # Usage: ./scripts/deployment/preflight-chain138-deploy.sh [--cost]
 #   --cost  Also run cost estimate (smom-dbis-138/scripts/deployment/calculate-costs-consolidated.sh).
+# Optional env: CHAIN138_PREFLIGHT_RPC_URL=https://...  Same chainId 138; use when Core RPC (2101) is down briefly
+#   (e.g. after tx-pool clear / RocksDB WAL) and public RPC (e.g. 192.168.11.221:8545) is up. Deploy still use Core when healthy.
 #
 # Requires: run from repo root. Uses smom-dbis-138/.env only (PRIVATE_KEY, RPC_URL_138).
 # See: docs/03-deployment/DEPLOYMENT_ORDER_OF_OPERATIONS.md § Deployment safety
@@ -54,6 +56,11 @@ else
 fi
 
 RPC="${RPC_URL_138:-http://192.168.11.211:8545}"
+# Optional: same chain, different endpoint (e.g. public RPC 2201) when Core 2101 is restarting after pool maintenance.
+if [[ -n "${CHAIN138_PREFLIGHT_RPC_URL:-}" ]]; then
+  RPC="$CHAIN138_PREFLIGHT_RPC_URL"
+  echo "NOTE: Using CHAIN138_PREFLIGHT_RPC_URL for this preflight only: $RPC" >&2
+fi
 if [[ -z "${PRIVATE_KEY:-}" ]]; then
   echo "FAIL: PRIVATE_KEY not set in $SMOM/.env." >&2
   exit 1