feat: implement payment service with error handling and validation

Add new payment service with repository, error handling, and validation
Add exceptions package with database and validation utilities
Update database package with new schema and zod types
Add turbo start script for development

packages/services/src/payment/errors.ts

@@ -0,0 +1,20 @@
+import { AppError, createAppError } from '@repo/exceptions';
+
+export enum PaymentErrorCode {
+  PAYMENT_NOT_FOUND = 'PAYMENT_NOT_FOUND',
+  PAYMENT_ALREADY_PROCESSED = 'PAYMENT_ALREADY_PROCESSED',
+}
+
+export type PaymentError = AppError<PaymentErrorCode>;
+
+export const paymentNotFound = (paymentId: string): PaymentError =>
+  createAppError<PaymentErrorCode>(
+    PaymentErrorCode.PAYMENT_NOT_FOUND,
+    `Payment with id ${paymentId} not found`
+  ) as PaymentError;
+
+export const paymentAlreadyProcessed = (paymentId: string): PaymentError =>
+  createAppError(
+    PaymentErrorCode.PAYMENT_ALREADY_PROCESSED,
+    `Payment ${paymentId} has already been processed`
+  ) as PaymentError;