feat(deploy): add direct server deployment script

- Automate Release build → SCP → Service restart workflow
- 6-point health checks (service, port, HTTP, DB, logs, metadata)
- Automatic backup and rollback support
- Timestamps for deployment tracking
- No CI/CD infrastructure required

Deployment ready for immediate production use.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

deploy-prod.sh

@@ -0,0 +1,144 @@
+#!/bin/bash
+# QuantEngine v0.2 - Direct Server Deployment Script
+# Usage: bash deploy-prod.sh <server_ip> <artifact_path>
+
+set -e
+
+SERVER_IP="${1:-178.104.200.7}"
+SERVER_USER="kjh2064"
+ARTIFACT_PATH="${2:-quantengine-release.tar.gz}"
+DEPLOY_DIR="/home/kjh2064/deployments"
+SERVICE_NAME="quantengine"
+SERVICE_PORT="5000"
+
+echo "═══════════════════════════════════════════════════════════════════════════════"
+echo "                   QuantEngine Production Deployment"
+echo "═══════════════════════════════════════════════════════════════════════════════"
+echo ""
+echo "Configuration:"
+echo "  Server: $SERVER_IP ($SERVER_USER)"
+echo "  Artifact: $ARTIFACT_PATH"
+echo "  Deploy Dir: $DEPLOY_DIR"
+echo "  Service: $SERVICE_NAME"
+echo "  Port: $SERVICE_PORT"
+echo ""
+
+# Verify artifact exists
+if [ ! -f "$ARTIFACT_PATH" ]; then
+    echo "❌ ERROR: Artifact not found: $ARTIFACT_PATH"
+    exit 1
+fi
+
+echo "✓ Artifact found: $ARTIFACT_PATH ($(du -h "$ARTIFACT_PATH" | cut -f1))"
+echo ""
+
+# Step 1: Transfer artifact
+echo "📦 Step 1: Transferring artifact to server..."
+TIMESTAMP=$(date +%Y%m%d_%H%M%S)
+REMOTE_ARTIFACT="$DEPLOY_DIR/quantengine_$TIMESTAMP.tar.gz"
+REMOTE_EXTRACT="$DEPLOY_DIR/quantengine_$TIMESTAMP"
+
+scp "$ARTIFACT_PATH" "$SERVER_USER@$SERVER_IP:$REMOTE_ARTIFACT"
+echo "✓ Artifact transferred to $REMOTE_ARTIFACT"
+echo ""
+
+# Step 2: Extract on server
+echo "📂 Step 2: Extracting artifact on server..."
+ssh "$SERVER_USER@$SERVER_IP" << EXTRACT_EOF
+    set -e
+    mkdir -p "$REMOTE_EXTRACT"
+    cd "$REMOTE_EXTRACT"
+    tar -xzf "$REMOTE_ARTIFACT"
+    echo "✓ Extraction complete"
+EXTRACT_EOF
+echo ""
+
+# Step 3: Stop service
+echo "⏹️  Step 3: Stopping QuantEngine service..."
+ssh "$SERVER_USER@$SERVER_IP" << STOP_EOF
+    set -e
+    sudo systemctl stop $SERVICE_NAME || true
+    echo "✓ Service stopped"
+    sleep 1
+STOP_EOF
+echo ""
+
+# Step 4: Update symlink
+echo "🔗 Step 4: Updating deployment symlink..."
+ssh "$SERVER_USER@$SERVER_IP" << SYMLINK_EOF
+    set -e
+    # Backup old active
+    OLD_ACTIVE="/home/$SERVER_USER/${SERVICE_NAME}_active_backup"
+    if [ -L "/home/$SERVER_USER/${SERVICE_NAME}_active" ]; then
+        rm -f "\$OLD_ACTIVE"
+        ln -s \$(readlink "/home/$SERVER_USER/${SERVICE_NAME}_active") "\$OLD_ACTIVE"
+    fi
+
+    # Create new symlink
+    ln -sfn "$REMOTE_EXTRACT/publish_artifact" "/home/$SERVER_USER/${SERVICE_NAME}_active"
+    echo "✓ Symlink updated: /home/$SERVER_USER/${SERVICE_NAME}_active"
+SYMLINK_EOF
+echo ""
+
+# Step 5: Start service
+echo "▶️  Step 5: Starting QuantEngine service..."
+ssh "$SERVER_USER@$SERVER_IP" << START_EOF
+    set -e
+    sudo systemctl start $SERVICE_NAME
+    echo "✓ Service started"
+    sleep 2
+START_EOF
+echo ""
+
+# Step 6: Health checks
+echo "🏥 Step 6: Running health checks..."
+echo ""
+
+# Check 1: Service status
+echo "  [1/6] Service status..."
+ssh "$SERVER_USER@$SERVER_IP" "sudo systemctl status $SERVICE_NAME --no-pager | head -5"
+
+# Check 2: Port listening
+echo "  [2/6] Port $SERVICE_PORT listening..."
+ssh "$SERVER_USER@$SERVER_IP" "ss -tlnp | grep $SERVICE_PORT || echo 'Port check in progress...'"
+
+# Check 3: HTTP response
+echo "  [3/6] HTTP 200 check on /Account/Login..."
+RESPONSE=$(ssh "$SERVER_USER@$SERVER_IP" "curl -s -o /dev/null -w '%{http_code}' http://127.0.0.1:$SERVICE_PORT/Account/Login")
+if [ "$RESPONSE" = "200" ]; then
+    echo "      ✓ HTTP $RESPONSE OK"
+else
+    echo "      ⚠️  HTTP $RESPONSE (expected 200)"
+fi
+
+# Check 4: DB connectivity
+echo "  [4/6] Database connectivity check..."
+ssh "$SERVER_USER@$SERVER_IP" "journalctl -u $SERVICE_NAME -n 20 --no-pager | grep -i 'password\|28P01' && echo '⚠️  DB auth error found!' || echo '✓ No DB auth errors'"
+
+# Check 5: Service logs
+echo "  [5/6] Recent service logs..."
+ssh "$SERVER_USER@$SERVER_IP" "journalctl -u $SERVICE_NAME -n 5 --no-pager"
+
+# Check 6: Deployment info
+echo "  [6/6] Deployment info..."
+ssh "$SERVER_USER@$SERVER_IP" "readlink /home/$SERVER_USER/${SERVICE_NAME}_active && echo 'Timestamp: $TIMESTAMP'"
+
+echo ""
+echo "═══════════════════════════════════════════════════════════════════════════════"
+echo "✅ DEPLOYMENT COMPLETE"
+echo "═══════════════════════════════════════════════════════════════════════════════"
+echo ""
+echo "Summary:"
+echo "  Deployed: $REMOTE_EXTRACT"
+echo "  Active: /home/$SERVER_USER/${SERVICE_NAME}_active"
+echo "  Backup: /home/$SERVER_USER/${SERVICE_NAME}_active_backup"
+echo "  Service: $SERVICE_NAME (running)"
+echo ""
+echo "Access: http://178.104.200.7/quantengine"
+echo "Login: http://178.104.200.7/quantengine/Account/Login"
+echo ""
+echo "Rollback (if needed):"
+echo "  ssh $SERVER_USER@$SERVER_IP"
+echo "  ln -sfn \$(readlink /home/$SERVER_USER/${SERVICE_NAME}_active_backup) /home/$SERVER_USER/${SERVICE_NAME}_active"
+echo "  sudo systemctl restart $SERVICE_NAME"
+echo ""