Feat: Serve max-i.webp for ?i= past the limit, and allow up to 1000 on ai.*

max-i.webp lists each site's range (40 main, 20 free, 1000 ai) and is drawn in code from design/max-i.html.
Other invalid ?i= values still serve bad.webp.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

index.html

@@ -110,7 +110,7 @@ Use images to complement your responses, powered by Brave.</code></pre>
                 </thead>
                 <tbody>
                     <tr><td><code>src</code></td><td><code>auroraimg-6m</code></td><td><code>auroraimg-6m</code></td></tr>
-                    <tr><td><code>i</code></td><td><code>1</code>–<code>20</code> (a different image each)</td><td><code>1</code></td></tr>
+                    <tr><td><code>i</code></td><td><code>1</code>–<code>1000</code> (a different image each)</td><td><code>1</code></td></tr>
                 </tbody>
             </table>
             <p style="font-size:0.85rem;color:var(--text-muted);">* The same query always gives the same image. When a search on direct-img.link or free.direct-img.link (without <code>src</code>) finds nothing, an AI image is served instead. Made with <a href="https://github.com/direct-img/AuroraIMG-6M">AuroraIMG-6M</a>.</p>