Add full documentation: MkDocs setup, API reference, user guide, deployment guide

docs/index.md

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+# Work Queue WebUI
+
+A web interface for managing TheLab's distributed work queue system. It connects to the [Work Queue API](https://git.danhenry.dev/thelab/work-queue-api) and presents queue state in real time.
+
+## Overview
+
+The Work Queue WebUI provides a visual interface for monitoring and managing work items dispatched to agents across TheLab's infrastructure.
+
+## Features
+
+- Real-time queue status monitoring
+- Agent activity tracking
+- Work item lifecycle visibility
+- Project-based work organization
+
+## Quick Start
+
+1. Open the WebUI in your browser (default: `http://localhost:8081`)
+2. View active work items and their current status
+3. Monitor agent activity and queue depth
+
+## Architecture
+
+The WebUI is a React frontend that communicates with the Work Queue API backend. It polls for updates and displays the current state of all queued, in-progress, and completed work items.
+
+```
+Browser → Work Queue WebUI → Work Queue API (app-01:8080) → PostgreSQL
+```
+
+## Related
+
+- [Work Queue API](https://git.danhenry.dev/thelab/work-queue-api)
+- [Deployment Guide](./deployment.md)
+- [API Reference](./api.md)