chore: import upstream snapshot with attribution

2026-07-13 13:32:57 +08:00
commit cd420f9332
4811 changed files with 884702 additions and 0 deletions
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+---
+area: webapp
+type: feature
+---
+
+Promo credits: a /promo signup landing page, redeeming a promo code when a new org selects a plan, and showing remaining credits on the usage page.