v1.0.0: URL-to-PDF + Doc Site Crawler

- Single URL to PDF via Puppeteer (Chrome headless)
- Doc Site Crawler: crawl entire documentation sites
  - Auto-extract all pages from TOC navigation
  - 20-page batch processing with browser restart (anti-OOM)
  - Output: PDF + Markdown
- Flask-style HTTP server on port 8099
- Deployed at https://pdf.donton.cloud/url2pdf

convert.js

@@ -0,0 +1,9 @@
+
+const puppeteer = require("puppeteer");
+(async () => {
+  const browser = await puppeteer.launch({headless: true, args: ["--no-sandbox", "--disable-gpu"]});
+  const page = await browser.newPage();
+  await page.goto(process.argv[2], {waitUntil: "networkidle2", timeout: 30000});
+  await page.pdf({path: process.argv[3], format: "A4", printBackground: true});
+  await browser.close();
+})();