docs: implement professional documentation structure and project hygiene

docs/scalability.md

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+# Thinking Bigger: Scalability & Future Roadmap
+
+Plexus is currently a robust MVP, but to scale to millions of users, we need to consider several architectural improvements.
+
+## 🚀 Scalability Improvements
+
+### 1. Backend Scaling
+- **Load Balancing**: Use Nginx or HAProxy to distribute traffic across multiple Node.js instances.
+- **Redis for Pub/Sub**: Currently, Socket.IO broadcasts are limited to a single server. Integrating Redis will allow broadcasting across multiple server instances.
+- **Database Sharding**: As the message history grows, sharding DuckDB or migrating to a distributed database like CockroachDB or ClickHouse (for analytics) may be necessary.
+
+### 2. Frontend Performance
+- **Code Splitting**: Use Vite's code-splitting features to reduce initial load times.
+- **Service Workers**: Implement PWA features for offline support and push notifications.
+- **Virtual Scrolling**: For channels with thousands of messages, implement virtual scrolling to maintain UI performance.
+
+## 🛠 Advanced Tooling
+
+### 1. CI/CD Pipeline
+- **GitHub Actions**: Automate linting, testing, and deployment.
+- **Automated Testing**: Expand test coverage with Playwright for E2E testing and Vitest for unit testing.
+
+### 2. Monitoring & Logging
+- **Prometheus & Grafana**: Track server performance and user metrics.
+- **Sentry**: Real-time error tracking and reporting.
+
+## 🌐 Decentralization Roadmap
+- **IPFS Integration**: Store media files and message history on IPFS for true decentralization.
+- **Smart Contracts**: Move the $PLEXUS transaction logic to on-chain Solana programs.
+- **DAO Governance**: Implement a DAO to allow users to vote on protocol changes.