Add stealth mode to browser scraper and Ronis.hr store

- Switch puppeteer to puppeteer-extra with stealth plugin to
  bypass Cloudflare bot detection
- Add Ronis.hr store config (JS-rendered, 48 products per page)
- Stealth mode patches navigator.webdriver, chrome runtime, and
  other fingerprints that Cloudflare checks

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

src/server/scraper/browser-scraper.ts

@@ -15,19 +15,19 @@ function log(msg: string) {
 async function getBrowser(): Promise<Browser> {
   if (browser && browser.connected) return browser;
 
-  const puppeteer = await import('puppeteer');
+  const puppeteerExtra = await import('puppeteer-extra');
+  const StealthPlugin = await import('puppeteer-extra-plugin-stealth');
+  puppeteerExtra.default.use(StealthPlugin.default());
 
   if (config.chromiumWs) {
-    // Connect to remote Chromium (Docker container)
     log(`Connecting to remote Chromium at ${config.chromiumWs}`);
-    browser = await puppeteer.default.connect({
+    browser = await puppeteerExtra.default.connect({
       browserWSEndpoint: config.chromiumWs,
-    });
-    log('Connected to remote Chromium');
+    }) as unknown as Browser;
+    log('Connected to remote Chromium (stealth mode)');
   } else {
-    // Fall back to local launch
-    log('Launching local Chromium...');
-    browser = await puppeteer.default.launch({
+    log('Launching local Chromium (stealth mode)...');
+    browser = await puppeteerExtra.default.launch({
       headless: true,
       args: [
         '--no-sandbox',
@@ -37,7 +37,7 @@ async function getBrowser(): Promise<Browser> {
         '--disable-extensions',
         '--no-first-run',
       ],
-    });
+    }) as unknown as Browser;
     log('Local Chromium launched');
   }