Fix FileBrowser download URL pattern in image galleries

/api/public/dl/{token}?files=/{name} returns empty ZIP.
Correct pattern is /api/public/dl/{token}/{name} (path-style).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Images/nomad-soul.html

@@ -313,7 +313,7 @@
             const originalName = idx[stem];
             
             if (originalName) {
-                const fullResUrl = `https://files.exopraxist.org/api/public/dl/${COLLECTION_TOKEN}?files=/${encodeURIComponent(originalName)}`;
+                const fullResUrl = `https://files.exopraxist.org/api/public/dl/${COLLECTION_TOKEN}/${encodeURIComponent(originalName)}`;
                 if (currentIndex === index) {
                     const img = new Image();
                     img.onload = () => {