[FEATURE] Web admin dashboard — real-time monitoring and management UI

[ElioNeto]

Description

ApexStore has a TUI (ratatui) but no web-based admin interface. Competitive databases provide a built-in web UI for monitoring and management.

Proposed Features

1. Dashboard at /admin/dashboard

   • Key count, SSTable count, per-CF breakdown
   • Real-time operation rate (ops/s chart)
   • Memory and disk usage gauges
   • Compaction backlog and progress bars

2. Key browser at /admin/keys

   • Paginated key-value explorer
   • Prefix search with auto-complete
   • JSON/hex inspector for values

3. Management at /admin/manage

   • Trigger flush/compaction buttons
   • Create/delete column families
   • Token management UI

Implementation

• Static HTML+JS served from embedded binary (include_dir! crate)
• REST API consumed via fetch()
• Real-time updates via Server-Sent Events

Labels

[ElioNeto]

Fixed in commit 1d8c830.