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.example

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+# AITBC GPU Miner Startup Script
+# Copy to start_gpu_miner.sh and adjust variables for your environment
+
+set -e
+
+# === CONFIGURE THESE ===
+COORDINATOR_URL="http://YOUR_COORDINATOR_IP:18000"
+MINER_API_KEY="your_miner_api_key"
+OLLAMA_HOST="http://127.0.0.1:11434"
+GPU_ID="gpu-0"
+
+echo "🔧 Starting AITBC GPU Miner"
+echo "Coordinator: $COORDINATOR_URL"
+echo "Ollama: $OLLAMA_HOST"
+echo ""
+
+# Check Ollama is running
+if ! curl -s "$OLLAMA_HOST/api/tags" > /dev/null 2>&1; then
+    echo "❌ Ollama not running at $OLLAMA_HOST"
+    echo "Start it with: ollama serve"
+    exit 1
+fi
+
+echo "✅ Ollama is running"
+
+# Check GPU
+if command -v nvidia-smi &> /dev/null; then
+    echo "GPU detected:"
+    nvidia-smi --query-gpu=name,memory.total --format=csv,noheader
+else
+    echo "⚠️  No NVIDIA GPU detected (CPU-only mode)"
+fi
+
+# Register miner
+echo ""
+echo "Registering miner with coordinator..."
+curl -s -X POST "$COORDINATOR_URL/v1/miners/register" \
+    -H "X-Api-Key: $MINER_API_KEY" \
+    -H "Content-Type: application/json" \
+    -d "{\"gpu_id\": \"$GPU_ID\", \"ollama_url\": \"$OLLAMA_HOST\"}"
+
+echo ""
+echo "✅ Miner registered. Starting heartbeat loop..."
+
+# Heartbeat + job polling loop
+while true; do
+    curl -s -X POST "$COORDINATOR_URL/v1/miners/heartbeat" \
+        -H "X-Api-Key: $MINER_API_KEY" > /dev/null 2>&1
+    sleep 10
+done