[Feature] Web dashboard for remote monitoring

[8dazo]

Description

A lightweight web dashboard to monitor agent activity, view logs, and manage settings remotely.

Depends on: #15, #20

Implementation

• Embed a minimal HTTP server in the app
• Provide JSON API for session/usage data
• Static React web UI (single page)
• Basic token-based authentication

Acceptance Criteria

• Dashboard accessible on local network via IP
• Real-time view of agent thinking/actions
• View usage statistics and logs

Inspired by

OpenClaw's Control UI and Gateway dashboard.