- Migration 024: adds capacity_hours column to users (default 40h/week)
- /api/resource-planning: aggregates hours from time_entries, open tasks,
active projects per user with utilisation calculations
- /resource-planning page: overview stats cards, per-member capacity bars
with colour-coded status (green=available, yellow=busy, orange=near
capacity, red=overloaded)
- Sidebar: new Resources nav item (BarChart3 icon)
