fix(admin): restore Vite admin source files

assets/admin/src/api/modules/payment.js

@@ -0,0 +1,7 @@
+export const paymentApiMethods = {
+  /* ================================================================
+   * 支付&付费 (Payment)
+   * ================================================================ */
+
+  getPaymentOverview() { return this.request('/payment/overview') },
+}