Fix avatar wallet balance by serving JSON from /wallet/balance.

The dropdown was fetching care.wallet (account redirect HTML) instead of a
billing balance API, so Alpine always fell back to "View wallet".

Co-authored-by: Cursor <cursoragent@cursor.com>

config/billing.php

@@ -4,6 +4,6 @@ return [
     'api_url' => env('BILLING_API_URL', 'https://ladill.com/api/billing'),
     'api_key' => env('BILLING_API_KEY_CARE'),
     'service' => 'care',
-    'wallet_balance_route' => 'care.wallet',
+    'wallet_balance_route' => 'wallet.balance',
     'currency' => 'GHS',
 ];