feat: add Playwright-based fallback scraper

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013gwc3aCiyQxmCWQke8RvEz

src/browserScraper.js

@@ -0,0 +1,25 @@
+const { chromium } = require('playwright');
+const { extractPrice } = require('./scraper');
+
+async function launchBrowser() {
+  return chromium.launch({ headless: true });
+}
+
+async function fetchAndExtractPriceViaBrowser(browser, url, { timeoutMs = 20000 } = {}) {
+  let page;
+  try {
+    page = await browser.newPage();
+    await page.goto(url, { waitUntil: 'domcontentloaded', timeout: timeoutMs });
+    const html = await page.content();
+    const { price, method } = extractPrice(html);
+    return { price, method, error: null };
+  } catch (err) {
+    return { price: null, method: null, error: err };
+  } finally {
+    if (page) {
+      await page.close().catch(() => {});
+    }
+  }
+}
+
+module.exports = { launchBrowser, fetchAndExtractPriceViaBrowser };