feat(refactor): refactor payment system to implement unified credit wallet.

- Updated environment variables and - configurations for credit purchases via Stripe, replacing legacy page pack system.
- Introduced auto-reload feature for credit top-ups and modified database models to track credit transactions.
- Updated notification system to handle insufficient credits and auto-reload failures.
- Adjusted API routes and schemas to reflect changes in credit management.

surfsense_web/zero/schema/user.ts

@@ -3,18 +3,16 @@ import { number, string, table } from "@rocicorp/zero";
 /**
  * Live-meter slice of the ``user`` table replicated through Zero.
  *
- * ``premiumCreditMicrosLimit`` / ``premiumCreditMicrosUsed`` are stored
- * as integer micro-USD (1_000_000 == $1.00). UI consumers divide by 1M
- * when displaying. Sensitive fields (email, hashed_password, oauth, etc.)
- * are intentionally omitted via the Postgres column-list publication so
- * they never enter WAL replication.
+ * ``creditMicrosBalance`` is stored as integer micro-USD (1_000_000 == $1.00);
+ * UI consumers divide by 1M when displaying and clamp at $0.00 (the balance can
+ * dip slightly negative when actual cost exceeds the pre-charge estimate).
+ * Sensitive fields (email, hashed_password, oauth, etc.) are intentionally
+ * omitted via the Postgres column-list publication so they never enter WAL
+ * replication.
  */
 export const userTable = table("user")
 	.columns({
 		id: string(),
-		pagesLimit: number().from("pages_limit"),
-		pagesUsed: number().from("pages_used"),
-		premiumCreditMicrosLimit: number().from("premium_credit_micros_limit"),
-		premiumCreditMicrosUsed: number().from("premium_credit_micros_used"),
+		creditMicrosBalance: number().from("credit_micros_balance"),
 	})
 	.primaryKey("id");