Add BigBang.hr store config (stealth Puppeteer, Cloudflare bypass)

Croatian electronics retailer behind Cloudflare. Works via Docker
Chromium with stealth plugin. 35 products per page, article.cp
containers with .cp-title for names, .current-price for prices.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

stores/bigbang-hr.yaml

@@ -0,0 +1,14 @@
+name: BigBang.hr
+base_url: https://www.bigbang.hr
+search_url: https://www.bigbang.hr/proizvodi/?search_q={query}
+category: Electronics
+currency: EUR
+render_js: true
+test_query: logitech
+
+selectors:
+  container: "article.cp"
+  name: ".cp-title"
+  price: ".current-price"
+  link: "a"
+  image: ".cp-image img"