Add pagination and API improvements

- Add pagination to effects list with infinite scroll
- Refactor home stats into reusable get_user_stats function
- Add /api/stats endpoint for CLI/API clients
- Add has_more flag to recipes listing
- Add JSON API support to storage type page

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/templates/effects/list.html

@@ -18,11 +18,11 @@
     </p>
 
     {% if effects %}
-    <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
+    <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4" id="effects-list">
         {% for effect in effects %}
         {% set meta = effect.meta or effect %}
         <a href="/effects/{{ effect.cid }}"
-           class="bg-gray-800 border border-gray-700 rounded-lg p-4 hover:border-gray-600 transition-colors">
+           class="effect-card bg-gray-800 border border-gray-700 rounded-lg p-4 hover:border-gray-600 transition-colors">
             <div class="flex items-center justify-between mb-2">
                 <span class="font-medium text-white">{{ meta.name or 'Unnamed' }}</span>
                 <span class="text-gray-500 text-sm">v{{ meta.version or '1.0.0' }}</span>
@@ -70,6 +70,17 @@
         </a>
         {% endfor %}
     </div>
+
+    {% if has_more %}
+    <div hx-get="/effects?offset={{ offset + limit }}&limit={{ limit }}"
+         hx-trigger="revealed"
+         hx-swap="afterend"
+         hx-select="#effects-list > *"
+         class="h-20 flex items-center justify-center text-gray-500">
+        Loading more...
+    </div>
+    {% endif %}
+
     {% else %}
     <div class="bg-gray-800 border border-gray-700 rounded-lg p-12 text-center">
         <p class="text-gray-500 mb-4">No effects uploaded yet.</p>