The stats handler initialized updates_by_type but never filled it, so the
"Updates by Type" card always rendered empty (Codeberg #10). Add
UpdateQueries.GetUpdatesByType (grouped by package_type, non-terminal scope)
and wire it into GetDashboardStats.
Severity bars were sized against total_updates (all statuses) while the
severity counts are scoped to non-terminal rows — a scope mismatch. Bars now
size against the sum of the scoped severity values, so they form a true
breakdown that always sums to 100% and never overflows.
Also closed the silent error-swallows in GetDashboardStats: each sub-count
failure is now logged [ERROR] [server] [stats] instead of vanishing.
9be8aba073