docs: add comprehensive README

README.md

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+# Homelab Topology Visualizer
+
+A responsive, real-time dashboard and visualizer for your homelab infrastructure.
+
+## Features Added via 10-Skill Integration
+
+This project has been thoroughly enhanced with 10 specific infrastructure and development skills:
+
+### 1. Backend & API Security \`api-security-hardening\`, \`nodejs-backend-patterns\`
+- Implemented **Helmet** for HTTP response headers.
+- Added **Rate Limiting** to prevent abuse on discovery endpoints.
+- Structured Error Handling with an object-oriented hierarchy (\`AppError\`) and a global error catching middleware.
+
+### 2. Observability & Logging \`observability-monitoring\`
+- Converted from console logs to **Pino** structured logging.
+- Includes a custom request logger middleware that outputs formatted JSON in production and readable logs via \`pino-pretty\` in development.
+
+### 3. Real-Time WebSockets \`websocket-engineer\`
+- Replaced HTTP polling with **Socket.IO** connections.
+- The UI maintains a live connection with the server, receiving \`topology:update\` events exactly when new data is discovered.
+- Features resilient reconnection with exponential backoff and connection status indicators in the dashboard footer.
+
+### 4. Containerization \`docker\`
+- Full local containerization.
+- Features a **Multi-Stage Dockerfile** that builds the Vite frontend and serves via a lightweight Node.js Alpine image.
+- A \`docker-compose.yml\` stack makes spinning up both the frontend and backend seamless. Includes a health-check endpoint.
+
+### 5. Testing Infrastructure \`vitest\`
+- Integrated **Vitest** for unit testing.
+- Includes thorough coverage formatting color utility functions and Zustand store actions. Run with \`npm test\`.
+
+### 6. Dashboards & Visualization \`data-visualizer\`
+- Added Recharts-inspired KPI panels (\`MetricsBar.tsx\`).
+- Included a pure CSS, screen-reader accessible bar chart mapping services to hosts (\`HostChart.tsx\`).
+- Accessible colorblind-safe color loops are enforced.
+
+### 7. Domain Types & Architecture \`infrastructure-monitoring\`, \`proxmox-admin\`, \`network-engineer\`
+- **Virtualization:** Native TypeScript support for Proxmox VMs and LXC containers with resource metrics.
+- **Networking:** Supported types for VLANs, subnets, and gateways.
+- **Monitoring:** API latency and performance are actively measured for network mapping jobs.
+
+## Running Locally
+
+To run this application via Docker Compose:
+
+\`\`\`bash
+# Build and start the containers
+docker-compose up -d --build
+
+# View logs
+docker-compose logs -f
+\`\`\`
+
+The applications will be running at:
+- **Frontend Dashboard:** http://localhost:3000
+- **Backend API:** http://localhost:3001
+
+## Development
+
+\`\`\`bash
+# Install dependencies
+npm ci
+
+# Start the dev server
+npm run dev
+\`\`\`
+
+## Testing
+
+\`\`\`bash
+# Run unit tests
+npm test
+
+# Run tests with coverage
+npm run test:coverage
+\`\`\`