Add Playwright headless browser as 3rd crawling fallback

Crawl chain: Jsoup → Jina Reader → Playwright (headless Chromium).
Error page detection (403, Access Denied, etc.) triggers next fallback.
Switch to exploded classpath for Playwright driver-bundle compatibility.
Fix Next.js standalone static file serving with symlink.

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

ecosystem.config.cjs

@@ -7,6 +7,7 @@ module.exports = {
       cwd: "/home/opc/sundol",
       env: {
         JAVA_HOME: "/usr/lib/jvm/java-21",
+        PLAYWRIGHT_NODEJS_PATH: "/home/opc/.playwright-driver/driver/linux/node",
       },
     },
     {