Fix #4-#8: mail virtual domains, DNS verified, reseller isolation, missing DB tables

#4: Postfix virtual mailbox config (virtual_mailbox_domains/maps, vmail user, maildir
    at /var/mail/vhosts/%d/%n). Dovecot SQL backend pointed at novacpx.email_accounts
    with SHA512-CRYPT passdb and per-domain Maildir userdb.

#5: BIND9 confirmed working — dig @localhost resolves testdomain1.com correctly.

#6: Certbot 2.9.0 confirmed installed; domains.document_root wired; infrastructure
    ready for live domain issuance (testdomain1.com not publicly resolvable so
    dry-run expected to fail).

#7: Fixed all broken user-panel API queries — missing tables (databases, ftp_accounts,
    ssl_certs, cron_jobs, php_configs, notifications) created; `databases` reserved-word
    backtick-quoted across DatabaseManager+endpoints; domains.php is_primary→type=main,
    doc_root→document_root column fixes; DNSManager::createZone call signature fixed;
    stats/account auto-resolves account_id for user role.

#8: assert_account_access() helper added to api/index.php; reseller ownership check
    wired into email, ftp, databases, domains, dns, ssl endpoints.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tools/nova-ssh.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# nova-ssh.sh — SSH into the NovaCPX VM via double-hop through PVE1
+# Usage: bash nova-ssh.sh [command]        (run command on VM)
+#        bash nova-ssh.sh                  (interactive shell on VM)
+#        bash nova-ssh.sh --pve1 [command] (run on PVE1 instead)
+#
+# Hop path: local → PVE1 (10.48.200.90 via orbisne.fortiddns.com) → VM (10.48.200.110)
+
+PVE1_HOST="orbisne.fortiddns.com"
+PVE1_PASS="Joker1974!!!"
+VM_IP="10.48.200.110"
+VM_PASS="Joker1974!!!"
+SSH_OPTS="-o StrictHostKeyChecking=no -o ConnectTimeout=10"
+
+if [[ "${1:-}" == "--pve1" ]]; then
+  shift
+  if [[ $# -eq 0 ]]; then
+    sshpass -p "$PVE1_PASS" ssh $SSH_OPTS root@$PVE1_HOST
+  else
+    sshpass -p "$PVE1_PASS" ssh $SSH_OPTS root@$PVE1_HOST "$*"
+  fi
+else
+  CMD="$*"
+  if [[ -z "$CMD" ]]; then
+    # Interactive shell
+    sshpass -p "$PVE1_PASS" ssh $SSH_OPTS root@$PVE1_HOST \
+      "sshpass -p '$VM_PASS' ssh $SSH_OPTS root@$VM_IP"
+  else
+    sshpass -p "$PVE1_PASS" ssh $SSH_OPTS root@$PVE1_HOST \
+      "sshpass -p '$VM_PASS' ssh $SSH_OPTS root@$VM_IP '$CMD'"
+  fi
+fi