Nextcloud-Integration: Dynamische Galerie + Auto-Thumbnails

- Galerie laedt Bilder dynamisch per JavaScript statt Jekyll-Loop
- nginx autoindex liefert JSON-Bilderliste
- Nextcloud-Ordner (Websitebilder) wird als Volume gemountet
- ImageMagick generiert automatisch 512px Thumbnails
- Hintergrund-Check alle 60s fuer neue Bilder
- Neuer entrypoint.sh fuer Thumbnail-Generierung + nginx Start

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

index.html

@@ -17,17 +17,7 @@ layout: default
 
     <!-- Main -->
     <div id="main" data-exif='{{ site.exif }}'>
-        {% for image in site.static_files %}
-        {% if image.path contains 'fulls' %}
-        <article class="thumb">
-            <a href="{{ site.baseurl }}{{ site.image_fulls_loc }}/{{ image.name }}" class="image">
-                <img src="{{ site.baseurl }}{{ site.image_thumbs_loc }}/{{ image.name }}" alt=""
-                     data-name="{{ image.name }}"/></a>
-            <!--<h2></h2>
-            <p></p>-->
-        </article>
-        {% endif %}
-        {% endfor %}
+        <!-- Galerie wird dynamisch per JavaScript geladen -->
     </div>
 
     <!-- Footer -->