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

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

deployment/systemd/explorer-api.service

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+[Unit]
+Description=ChainID 138 Explorer API Service
+Documentation=https://github.com/explorer/backend
+After=network.target postgresql.service
+Requires=postgresql.service
+
+[Service]
+Type=simple
+User=explorer
+Group=explorer
+WorkingDirectory=/home/explorer/explorer-monorepo/backend
+EnvironmentFile=/home/explorer/explorer-monorepo/.env
+ExecStart=/usr/local/bin/explorer-api
+Restart=always
+RestartSec=10
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=explorer-api
+
+# Security settings
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectSystem=strict
+ProtectHome=read-only
+ReadWritePaths=/home/explorer/explorer-monorepo
+
+# Resource limits
+LimitNOFILE=65536
+LimitNPROC=4096
+
+[Install]
+WantedBy=multi-user.target
+