feat: Add Docker containerization for consistent deployment

- Multi-stage Dockerfile with Node.js 20 Alpine base
- Production and development docker-compose configurations
- Health check API endpoint for container monitoring
- Build and deployment scripts with versioning support
- Port 3000 configuration for nginx compatibility
- Non-root user and security hardening
- Resource limits and logging configuration
- Package.json scripts for Docker operations

This eliminates dependency conflicts and provides reproducible deployments.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/pages/api/health.ts

@@ -0,0 +1,34 @@
+import type { APIRoute } from 'astro';
+
+export const GET: APIRoute = async () => {
+  try {
+    // Basic health check - could be extended to check database connectivity
+    const healthStatus = {
+      status: 'healthy',
+      timestamp: new Date().toISOString(),
+      version: process.env.npm_package_version || '1.0.0',
+      environment: process.env.NODE_ENV || 'development',
+      uptime: process.uptime()
+    };
+
+    return new Response(JSON.stringify(healthStatus), {
+      status: 200,
+      headers: {
+        'Content-Type': 'application/json',
+        'Cache-Control': 'no-cache'
+      }
+    });
+  } catch (error) {
+    return new Response(JSON.stringify({
+      status: 'unhealthy',
+      timestamp: new Date().toISOString(),
+      error: error instanceof Error ? error.message : 'Unknown error'
+    }), {
+      status: 503,
+      headers: {
+        'Content-Type': 'application/json',
+        'Cache-Control': 'no-cache'
+      }
+    });
+  }
+};