feat(billing): add formula A/B admin UI and subscription renew status

Expose dual metering formula editing with batch user assignment, show
auto-renew and pending-recharge states in subscriptions, and document
billing acceptance checks for production rollout.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/types.ts

@@ -18,6 +18,7 @@ export type PortalUser = {
   balanceCents: number;
   totalCreditCents?: number;
   tokensUsed: number;
+  billingFormula?: 'A' | 'B';
   spaceQuotaBytes?: number;
   spaceUsedBytes?: number;
   spaceReservedBytes?: number;
@@ -44,6 +45,7 @@ export type AuthStatus = {
 };
 
 export type AdminUserRow = PortalUser & {
+  billingFormula?: 'A' | 'B';
   createdAt: number;
   updatedAt: number;
 };
@@ -676,8 +678,20 @@ export type BillingAdminConfig = {
   costEstimateOutputUsdPer1M: number;
 };
 
+export type BillingFormulaKey = 'A' | 'B';
+
+export type BillingFormulaMeta = {
+  updatedAt: number | null;
+  updatedBy: string | null;
+  source?: string;
+};
+
 export type BillingAdminConfigResponse = {
   config: BillingAdminConfig;
+  formulas?: Record<BillingFormulaKey, BillingAdminConfig>;
+  formulaMeta?: Record<BillingFormulaKey, BillingFormulaMeta>;
+  activeFormula?: BillingFormulaKey;
+  defaultFormula?: BillingFormulaKey;
   updatedAt: number | null;
   updatedBy: string | null;
   source?: string;
@@ -722,6 +736,7 @@ export type AdminSubscription = {
   periodImagesLimit: number;
   periodImagesUsed: number;
   periodImagesBonus?: number;
+  autoRenew?: boolean;
   note: string | null;
   createdAt: number;
 };