docs: add directory existence checks to multi-node workflow

- Add verification step before creating directories
- Check if /var/lib/aitbc/ structure already exists
- Provide feedback if directories need to be created
- Apply to both aitbc1 (localhost) and aitbc (remote) setup sections
- More robust directory handling for existing installations

.windsurf/workflows/multi-node-blockchain-setup.md

@@ -47,9 +47,12 @@ git pull origin main
 # Install/update dependencies
 /opt/aitbc/venv/bin/pip install -r requirements.txt
 
-# Create required directories
+# Check and create required directories if they don't exist
 mkdir -p /var/lib/aitbc/data /var/lib/aitbc/keystore /etc/aitbc /var/log/aitbc
 
+# Verify directories exist
+ls -la /var/lib/aitbc/ || echo "Creating /var/lib/aitbc/ structure..."
+
 # Copy and adapt central .env for aitbc1 (genesis authority)
 cp /opt/aitbc/.env /opt/aitbc/.env.aitbc1.backup
 
@@ -119,9 +122,12 @@ git pull origin main
 # Install/update dependencies
 /opt/aitbc/venv/bin/pip install -r requirements.txt
 
-# Create required directories
+# Check and create required directories if they don't exist
 mkdir -p /var/lib/aitbc/data /var/lib/aitbc/keystore /etc/aitbc /var/log/aitbc
 
+# Verify directories exist
+ls -la /var/lib/aitbc/ || echo "Creating /var/lib/aitbc/ structure..."
+
 # Copy and adapt central .env for aitbc (follower node)
 cp /opt/aitbc/.env /opt/aitbc/.env.aitbc.backup