chore(systemd): remove obsolete systemd service files and update infrastructure documentation

- Remove 8 unused systemd service files from coordinator-api/systemd/
  - aitbc-adaptive-learning.service (port 8005)
  - aitbc-advanced-ai.service
  - aitbc-enterprise-api.service
  - aitbc-gpu-multimodal.service (port 8003)
  - aitbc-marketplace-enhanced.service (port 8006)
  - aitbc-modality-optimization.service (port 8004)
  - aitbc-multimodal.service (port 8002)
  - aitbc-openclaw-enhanced.service (port 8007

dev/ops/install_miner_systemd.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SERVICE_NAME="aitbc-miner"
+APP_DIR="/opt/aitbc/apps/miner-node"
+VENV_DIR="$APP_DIR/.venv"
+LOG_DIR="/var/log/aitbc"
+SYSTEMD_PATH="/etc/systemd/system/${SERVICE_NAME}.service"
+
+if [[ $EUID -ne 0 ]]; then
+  echo "This script must be run as root" >&2
+  exit 1
+fi
+
+install -d "$APP_DIR" "$LOG_DIR"
+install -d "/etc/aitbc"
+
+if [[ ! -d "$VENV_DIR" ]]; then
+  python3 -m venv "$VENV_DIR"
+fi
+source "$VENV_DIR/bin/activate"
+
+pip install --upgrade pip
+pip install -r "$APP_DIR/requirements.txt" || true
+
+deactivate
+
+install -m 644 "$(pwd)/config/systemd/${SERVICE_NAME}.service" "$SYSTEMD_PATH"
+
+systemctl daemon-reload
+systemctl enable --now "$SERVICE_NAME"
+
+echo "${SERVICE_NAME} systemd unit installed and started."