feat: stripe integration

prisma/migrations/20250424103453_stripe_customer_id/migration.sql

@@ -0,0 +1,10 @@
+/*
+  Warnings:
+
+  - You are about to drop the column `token_balance` on the `users` table. All the data in the column will be lost.
+
+*/
+-- AlterTable
+ALTER TABLE "users" DROP COLUMN "token_balance",
+ADD COLUMN     "ai_balance" INTEGER NOT NULL DEFAULT 0,
+ADD COLUMN     "stripe_customer_id" TEXT;