Refactor PaymentService methods for clarity and consistency

- Rename methods in PaymentService for improved readability: payInvoiceWithUserWallet to payWithWallet, openExternalLightningWallet to openExternalWallet, and handlePaymentWithFallback to handlePayment.
- Update related composables (useTicketPurchase, useLightningPayment) to reflect method name changes, ensuring consistent usage across the application.
- Modify RelayHub initialization process to set relay URLs before calling initialize, enhancing configuration clarity.
- Remove legacy compatibility flags in RelayHub to streamline the codebase and improve maintainability.

src/modules/base/index.ts

@@ -38,7 +38,8 @@ export const baseModule: ModulePlugin = {
     container.provide('pwaService', pwaService)
 
     // Initialize core services
-    await relayHub.initialize(options?.config?.nostr?.relays || [])
+    relayHub.setRelayUrls(options?.config?.nostr?.relays || [])
+    await relayHub.initialize()
     await auth.initialize({
       waitForDependencies: false, // Auth has no dependencies
       maxRetries: 1