New cookie-gated "Users" tab on the operator dashboard: a sortable view
of every credit-ledger row (typed cloud/license/install) with computed
remaining/total balances, key filter, and a per-row "grant free credits"
action.
Endpoints (routes/admin.js):
- GET /admin/credits — snapshotAll() enriched with a type derived from
the credit-key prefix and a computed balance (computeRemaining against
live tier quotas), since the ledger stores consumed counters only.
- POST /admin/credits/grant {credit_key, amount} — adds free top-up via
addPurchasedCredits. Grants land in the never-expires purchased bucket
(spent after the tier allowance). Guards: positive integer, <=1,000,000,
and the row must already exist (a typo can't spawn a ghost row).
Admin-only; no /relay/* client contract change. Tests added in
server/test/admin-credits.test.js (mount the real router over HTTP).
Version bumped 0.2.124 -> 0.2.125.
Keysat