Feature/platform upgrade nextjs #57
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This PR upgrades Metamorphosis from a React/Webpack monitoring tool to a Next.js 14+ observability platform with TypeScript. It adds consumer lag heatmaps with per-partition visualization, an alerting engine supporting Email/Slack/Webhook, enhanced broker metrics (JVM, GC, disk I/O, threads), and TimescaleDB for historical data and trend analysis. The platform now supports multi-cluster management, cloud connectors for AWS MSK/Confluent Cloud/Redpanda, an extensible plugin system with example plugins, and PDF/CSV export. The UI includes dark/light theme support and improved responsiveness. Deployment includes Docker Compose, Helm charts, and Kubernetes manifests. The codebase is fully migrated to TypeScript with Next.js App Router, Socket.io for real-time updates, and a plugin architecture for extensibility. All existing functionality is preserved while adding enterprise features. The platform is production-ready for core observability use cases