Adds `BillingCreditService.creditWorkspaceBalance({ workspaceId,
amountMicro })`, an internal, server-side primitive to grant spendable
resource credits to a workspace. This is the backend foundation for
awarding free credits during the new onboarding steps; there was no
existing way to add credits to a workspace.
What it does:
- Increments `billingCustomer.creditBalanceMicro` atomically
(workspace-scoped), then flushes the Redis available-credits cache so
the credit is immediately spendable, not just shown in the gauge.
- No-ops when billing is disabled or no billing customer exists; rejects
non-positive/non-finite amounts.
- Pure primitive with no GraphQL/REST surface; the caller owns
idempotency.
Notes for reviewers:
- Credits use the existing `RESOURCE_CREDIT` currency (micro units, 1
display credit = 1,000,000 micro).
- The credited balance is overwritten by the rollover job at the next
billing-period renewal, so it is not guaranteed to persist across
periods (intentional for onboarding bonuses).
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Raphaël Bosi
6b460da622
