Explorer + Snap: nginx /snap 200, runbook, apply-nginx script, verify docs

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

scripts/verify-vmid5000-all.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# Run all VMID 5000 deployment checks: explorer frontend, Blockscout API, Snap site.
+# Usage: ./verify-vmid5000-all.sh [BASE_URL]
+#   BASE_URL defaults to https://explorer.d-bis.org
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+BASE_URL="${1:-https://explorer.d-bis.org}"
+
+echo "=============================================="
+echo "VMID 5000 – full verification"
+echo "BASE_URL=$BASE_URL"
+echo "=============================================="
+echo ""
+
+bash "$SCRIPT_DIR/verify-explorer-api-access.sh" "$BASE_URL"