chore: add Docker deployment setup and health check wiring

- Add multi-stage Dockerfile for backend (SDK build → ASP.NET runtime,
  non-root user, /health HEALTHCHECK)
- Add docker-compose.dev.yml orchestrating extrudex-api + control-center-web
- Add deploy.sh convenience script wrapping docker compose up --build
- Wire ASP.NET health checks: AddHealthChecks().AddNpgSql() + MapHealthChecks("/health")
- Add backend .dockerignore (comprehensive pattern list)
- Exclude frontend/dist, frontend/node_modules, frontend/.angular from git

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

deploy.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+set -e
+
+echo "🔧 Deploying Extrudex Docker runtime..."
+
+# Check if Docker Compose is available
+if ! command -v docker-compose &> /dev/null && ! docker compose version &> /dev/null; then
+    echo "❌ Docker Compose is not installed"
+    exit 1
+fi
+
+COMPOSE_CMD="docker compose"
+if command -v docker-compose &> /dev/null; then
+    COMPOSE_CMD="docker-compose"
+fi
+
+echo "📦 Building and starting services..."
+$COMPOSE_CMD -f docker-compose.dev.yml up -d --build
+
+echo "⏳ Waiting for services to become healthy..."
+sleep 10
+
+echo "✅ Deployment complete!"
+echo ""
+echo "Services running:"
+echo "  • Extrudex API: http://localhost:5080"
+echo "  • Control Center Web: http://localhost:5081"
+echo ""
+echo "To view logs:"
+echo "  $COMPOSE_CMD -f docker-compose.dev.yml logs -f"
+echo ""
+echo "To stop:"
+echo "  $COMPOSE_CMD -f docker-compose.dev.yml down"