Two small polish items that together close the signup-to-running-tenant
flow for real users:
1. Stripe success_url now points at /orgs?checkout=success instead of
the current page (was pricing). The old behavior left people staring
at plan cards with no indication payment went through — the new
behavior drops them right onto their org list where they can watch
the status flip.
2. /orgs shows a green "Payment confirmed, workspace spinning up"
banner when it sees ?checkout=success, then clears the query
param via replaceState so a reload doesn't show it again.
3. /orgs now polls every 5s while any org is awaiting_payment or
provisioning. Users see the Stripe webhook's effect live — no
manual refresh needed — and once every org settles the polling
stops so idle tabs don't hammer /cp/orgs.
Paired with PR #992 (the /orgs page itself) this makes the end-to-end
flow on BILLING_REQUIRED=true deployments feel right:
/pricing → Stripe → /orgs?checkout=success → banner → live poll →
"Open" button when org.status transitions to running.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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