Implement updateWalletBalance method in PaymentService and deprecate AuthService method

- Added updateWalletBalance method in PaymentService to handle wallet balance updates from WebSocket notifications, improving wallet management.
- Deprecated the existing updateWalletBalance method in AuthService, redirecting calls to the new PaymentService method for better consistency and maintainability.
- Updated WalletWebSocketService to utilize PaymentService for balance updates, ensuring accurate wallet state management.

These changes enhance the architecture of wallet balance handling and streamline the update process across services.

src/core/services/PaymentService.ts

@@ -117,6 +117,39 @@ export class PaymentService extends BaseService {
     return wallet?.inkey || null
   }
 
+  /**
+   * Update wallet balance from WebSocket notifications
+   * @param balanceMsat - The new balance in millisatoshis
+   * @param walletId - Optional wallet ID (defaults to preferred wallet)
+   */
+  updateWalletBalance(balanceMsat: number, walletId?: string): void {
+    if (!this.authService?.user?.value?.wallets?.length) {
+      this.debug('No wallets available to update')
+      return
+    }
+
+    // Determine which wallet to update
+    let walletToUpdate
+    if (walletId) {
+      walletToUpdate = this.authService.user.value.wallets.find((w: any) => w.id === walletId)
+    } else {
+      // Use preferred wallet if no ID specified
+      walletToUpdate = this.getPreferredWallet()
+    }
+
+    if (walletToUpdate) {
+      const oldBalance = walletToUpdate.balance_msat
+      walletToUpdate.balance_msat = balanceMsat
+
+      // Trigger reactivity in AuthService
+      this.authService.user.value = { ...this.authService.user.value }
+
+      this.debug(`Wallet ${walletToUpdate.id} balance updated: ${oldBalance} -> ${balanceMsat} msat (${Math.round(balanceMsat/1000)} sats)`)
+    } else {
+      this.debug(`Wallet ${walletId} not found for balance update`)
+    }
+  }
+
   /**
    * Generate QR code for Lightning payment request
    */