fix(wallet): allow discharging leftover fractional count-product gold

Admin charge can now wipe the exact remaining balance when a count product has a leftover decimal amount.

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

app/Http/Controllers/Admin/WalletController.php

@@ -560,10 +560,6 @@ class WalletController extends Controller
         $deposit = $value > 0;
 
         $payload = Controller::productUnitPayload($product);
-        if (Controller::isCountBasedProduct($payload) && abs($value - round($value)) > 0.000001) {
-            throw new UnprocessableEntityHttpException('برای محصول تعدادی فقط عدد صحیح مجاز است');
-        }
-
         $isMainWalletProduct = Controller::isMainWalletProduct($productId);
         if (!$deposit && $isMainWalletProduct) {
             $this->consolidateOrphanedMainWalletGold((int) $customer->id, (int) $customer->type);
@@ -577,6 +573,18 @@ class WalletController extends Controller
             $effectiveProductId
         );
         $wallet = $wallet_interface->wallet;
+        $availableGold = is_null($wallet) ? 0.0 : (float) $wallet->gold;
+        $wipingRemainder = !$deposit
+            && $availableGold > 0
+            && abs($availableGold - abs($value)) <= 1e-6;
+
+        if (
+            Controller::isCountBasedProduct($payload)
+            && abs($value - round($value)) > 0.000001
+            && ! $wipingRemainder
+        ) {
+            throw new UnprocessableEntityHttpException('برای محصول تعدادی فقط عدد صحیح مجاز است');
+        }
 
         if (!$deposit) {
             $available = is_null($wallet) ? 0.0 : (float) $wallet->gold;