Consolidate service scripts into apps directories

- Move blockchain scripts to apps/blockchain-node/scripts/
- Move marketplace scripts to apps/marketplace/scripts/
- Move agent daemon to apps/agent-coordinator/scripts/
- Move monitor to apps/monitor/
- Update systemd service files to point to new locations
- Update internal path references in moved scripts
- Remove empty /opt/aitbc/services directory

dev/gpu/start_gpu_miner.sh.example

@@ -1,3 +1,4 @@
+
 #!/bin/bash
 
 # AITBC GPU Miner Startup Script
@@ -25,12 +26,14 @@ fi
 
 echo "✅ Ollama is running"
 
-# Check GPU
+# Check GPU (NVIDIA required)
 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)"
+    echo "❌ No NVIDIA GPU detected"
+    echo "NVIDIA GPU is required for GPU mining"
+    exit 1
 fi
 
 # Register miner