fix: bump asset versions to force cache bust; price rate limit own bucket

- app.js and style.css versioned to 20260507a so browsers load new code
- get_shopping_price / get_all_shopping_prices moved to dedicated 'price'
  rate-limit bucket (60 req/min) separate from general (120 req/min)
  to avoid false 429s during sequential per-item price loading

index.html

@@ -11,7 +11,7 @@
     <title>EverShelf</title>
     <link rel="manifest" href="manifest.json">
     <link rel="icon" type="image/png" href="assets/img/logo/logo_icon.png">
-    <link rel="stylesheet" href="assets/css/style.css?v=20260506e">
+    <link rel="stylesheet" href="assets/css/style.css?v=20260507a">
     <!-- QuaggaJS for barcode scanning -->
     <script src="https://cdn.jsdelivr.net/npm/@ericblade/quagga2@1.8.4/dist/quagga.min.js"></script>
     <!-- @xenova/transformers: ES-module bootstrap that exposes a lazy category-classifier as window._categoryPipelinePromise -->
@@ -1461,6 +1461,6 @@
     </div>
 </div>
 
-<script src="assets/js/app.js?v=20260505a"></script>
+<script src="assets/js/app.js?v=20260507a"></script>
 </body>
 </html>