Add full monorepo: virtual-banker, backend, frontend, docs, scripts, deployment

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/cron/README.md

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+# Explorer maintenance cron
+
+Automated jobs to prevent 502s, disk full, and nginx downtime on VMID 5000 (explorer.d-bis.org).
+
+## Install (one-time)
+
+From the **explorer-monorepo** directory:
+
+**On Proxmox host that has VMID 5000:**
+```bash
+bash scripts/cron/install-explorer-cron.sh
+```
+
+**From your machine (SSH to node):**
+```bash
+EXPLORER_VM_HOST=root@192.168.11.12 bash scripts/cron/install-explorer-cron.sh
+```
+
+## What gets installed (inside VMID 5000)
+
+| Schedule | Job | Purpose |
+|----------|-----|--------|
+| Every 5 min | `/usr/local/bin/explorer-maintain.sh` | If API ≠ 200: restart Blockscout or start from docker-compose. If nginx inactive: start nginx. |
+| Daily 03:15 | `RUN_PRUNE=1 /usr/local/bin/explorer-maintain.sh` | If disk usage ≥ 90%: safe prune (unused images + build cache only; **no** container prune). |
+
+Log file: `/var/log/explorer-maintain.log` (inside the VM).
+
+## Verify
+
+```bash
+# On Proxmox host
+pct exec 5000 -- crontab -l
+pct exec 5000 -- tail -20 /var/log/explorer-maintain.log
+```
+
+## Uninstall
+
+```bash
+pct exec 5000 -- bash -c '(crontab -l 2>/dev/null | grep -v explorer-maintain | grep -v /usr/local/bin/explorer-maintain.sh) | crontab -'
+pct exec 5000 -- rm -f /usr/local/bin/explorer-maintain.sh
+```