Widen order price columns so current gold rial quotes persist.

Gold gram prices now exceed the old DECIMAL/INT range and MySQL 1264 aborted buys; store money fields as DECIMAL(20,4) and hide the raw SQL error from the app.

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

app/Exceptions/Handler.php

@@ -37,5 +37,18 @@ class Handler extends ExceptionHandler
         $this->reportable(function (Throwable $e) {
             //
         });
+
+        $this->renderable(function (\Illuminate\Database\QueryException $e, $request) {
+            if ((int) ($e->errorInfo[1] ?? 0) !== 1264) {
+                return null;
+            }
+            if (! $request->expectsJson()) {
+                return null;
+            }
+
+            return response()->json([
+                'message' => 'ثبت سفارش به‌خاطر محدودیت فیلد قیمت ممکن نشد. لطفاً دوباره تلاش کنید.',
+            ], 422);
+        });
     }
 }