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/start_remote_tunnel.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+# Start SSH tunnel to remote AITBC coordinator
+
+echo "Starting SSH tunnel to remote AITBC coordinator..."
+
+# Check if tunnel is already running
+if pgrep -f "ssh.*-L.*8001:localhost:8000.*aitbc" > /dev/null; then
+    echo "✅ Tunnel is already running"
+    exit 0
+fi
+
+# Start the tunnel
+ssh -f -N -L 8001:localhost:8000 aitbc
+
+if [ $? -eq 0 ]; then
+    echo "✅ SSH tunnel established on port 8001"
+    echo "   Remote coordinator available at: http://localhost:8001"
+    echo "   Health check: curl http://localhost:8001/v1/health"
+else
+    echo "❌ Failed to establish SSH tunnel"
+    exit 1
+fi