docs: add web UI feature to v0.4.0 roadmap

Add comprehensive web dashboard interface to planned features for v0.4.0.

Web UI Features:
- Job management dashboard
  * View/monitor active, pending, and completed jobs
  * Start new simulations with form-based configuration
  * Real-time job progress monitoring
  * Cancel running jobs

- Results visualization
  * Performance charts (P&L over time, cumulative returns)
  * Position history timeline
  * Model comparison views
  * Trade log explorer with filtering

- Configuration management
  * Model configuration editor
  * Date range selection with calendar picker
  * Price data coverage visualization

- Technical implementation
  * Modern frontend framework (React, Vue.js, or Svelte)
  * Real-time updates via WebSocket or Server-Sent Events
  * Responsive design for mobile access
  * Chart library for visualizations
  * Single container deployment alongside API

The web UI will provide an accessible interface for users who prefer
graphical interaction over API calls, while maintaining the same
functionality available through the REST API.

Generated with [Claude Code](https://claude.com/claude-code)

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

ROADMAP.md

@@ -43,6 +43,29 @@ This document outlines planned features and improvements for the AI-Trader proje
   - `GET /data/status` - Check download progress and rate limits
   - `DELETE /data/range` - Remove price data for specific date ranges
 
+#### Web UI
+- **Dashboard Interface** - Web-based monitoring and control interface
+  - Job management dashboard
+    - View active, pending, and completed jobs
+    - Start new simulations with form-based configuration
+    - Monitor job progress in real-time
+    - Cancel running jobs
+  - Results visualization
+    - Performance charts (P&L over time, cumulative returns)
+    - Position history timeline
+    - Model comparison views
+    - Trade log explorer with filtering
+  - Configuration management
+    - Model configuration editor
+    - Date range selection with calendar picker
+    - Price data coverage visualization
+  - Technical implementation
+    - Modern frontend framework (React, Vue.js, or Svelte)
+    - Real-time updates via WebSocket or SSE
+    - Responsive design for mobile access
+    - Chart library (Plotly.js, Chart.js, or Recharts)
+    - Served alongside API (single container deployment)
+
 ## Contributing
 
 We welcome contributions to any of these planned features! Please see [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines.