fix(price): include product file_id in SSE list identity

Image uploads were ignored by the live list hash, so the stream kept republishing a stale product payload and the theme reverted to the old photo.

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

app/Services/PriceBroadcastService.php

@@ -175,8 +175,11 @@ class PriceBroadcastService
                 continue;
             }
 
+            $file = is_array($product['file'] ?? null) ? $product['file'] : [];
+
             $identity[] = [
                 'id' => (int) ($product['id'] ?? 0),
+                'file_id' => (int) ($product['file_id'] ?? ($file['id'] ?? 0)),
                 'price' => (int) ($product['price'] ?? 0),
                 'price_profit' => (int) ($product['price_profit'] ?? 0),
                 'amount' => (float) ($product['amount'] ?? 0),