feat: add URL-to-PDF examples to examples page

- Add 'URL to PDF' nav link and example section
- Show basic and advanced cURL examples for /v1/convert/url
- Include security notes (JS disabled, private URLs blocked)
- Add test coverage for the new section

public/examples.html

@@ -111,6 +111,7 @@ footer .container { display: flex; justify-content: space-between; align-items:
       <a href="#markdown">Markdown</a>
       <a href="#charts">Charts</a>
       <a href="#receipt">Receipt</a>
+      <a href="#url-to-pdf">URL to PDF</a>
       <a href="#nodejs">Node.js</a>
       <a href="#python">Python</a>
       <a href="#go">Go</a>
@@ -270,6 +271,36 @@ footer .container { display: flex; justify-content: space-between; align-items:
       </div>
     </section>
 
+    <!-- URL to PDF -->
+    <section id="url-to-pdf" class="example-section">
+      <h2>URL to PDF</h2>
+      <p>Capture a live webpage and convert it to PDF. Send a URL to the <code>/v1/convert/url</code> endpoint and get a rendered PDF back. JavaScript is disabled for security (SSRF protection), and private/internal URLs are blocked.</p>
+
+      <div class="code-block">
+        <span class="code-label">curl — basic</span>
+        <pre><code>curl -X POST https://docfast.dev/v1/convert/url \
+  -H <span class="str">"Authorization: Bearer YOUR_API_KEY"</span> \
+  -H <span class="str">"Content-Type: application/json"</span> \
+  -d <span class="str">'{"url": "https://example.com"}'</span> \
+  --output page.pdf</code></pre>
+      </div>
+
+      <div class="code-block">
+        <span class="code-label">curl — with options</span>
+        <pre><code>curl -X POST https://docfast.dev/v1/convert/url \
+  -H <span class="str">"Authorization: Bearer YOUR_API_KEY"</span> \
+  -H <span class="str">"Content-Type: application/json"</span> \
+  -d <span class="str">'{
+    "url": "https://example.com",
+    "format": "A4",
+    "margin": { "top": "20mm", "bottom": "20mm" },
+    "scale": 0.8,
+    "printBackground": true
+  }'</span> \
+  --output page.pdf</code></pre>
+      </div>
+    </section>
+
     <!-- Node.js -->
     <section id="nodejs" class="example-section">
       <h2>Node.js Integration</h2>