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/gpu/start_gpu_miner.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+# Start GPU Miner Client
+
+echo "=== AITBC GPU Miner Client Startup ==="
+echo "Starting GPU miner client..."
+echo ""
+
+# Check if GPU is available
+if ! command -v nvidia-smi &> /dev/null; then
+    echo "WARNING: nvidia-smi not found, GPU may not be available"
+fi
+
+# Show GPU info
+if command -v nvidia-smi &> /dev/null; then
+    echo "=== GPU Status ==="
+    nvidia-smi --query-gpu=name,memory.used,memory.total,utilization.gpu,temperature.gpu --format=csv,noheader,nounits
+    echo ""
+fi
+
+# Check if coordinator is running
+echo "=== Checking Coordinator API ==="
+if curl -s http://localhost:9080/health > /dev/null 2>&1; then
+    echo "✓ Coordinator API is running on port 9080"
+else
+    echo "✗ Coordinator API is not accessible on port 9080"
+    echo "  The miner will wait for the coordinator to start..."
+fi
+
+echo ""
+echo "=== Starting GPU Miner ==="
+cd /home/oib/windsurf/aitbc
+exec python3 scripts/gpu/gpu_miner_host.py