Fix item visibility bugs and add effects web UI

- Fix recipe filter to allow owner=None (S-expression compiled recipes)
- Fix media uploads to use category (video/image/audio) not MIME type
- Fix IPFS imports to detect and store correct media type
- Add Effects navigation link between Recipes and Media
- Create effects list and detail templates with upload functionality
- Add cache/not_found.html template (was missing)
- Add type annotations to service classes
- Add tests for item visibility and effects web UI (30 tests)

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

app/templates/base.html

@@ -6,6 +6,7 @@
 <nav class="flex items-center space-x-6">
     <a href="/runs" class="text-gray-300 hover:text-white {% if active_tab == 'runs' %}text-white font-medium{% endif %}">Runs</a>
     <a href="/recipes" class="text-gray-300 hover:text-white {% if active_tab == 'recipes' %}text-white font-medium{% endif %}">Recipes</a>
+    <a href="/effects" class="text-gray-300 hover:text-white {% if active_tab == 'effects' %}text-white font-medium{% endif %}">Effects</a>
     <a href="/media" class="text-gray-300 hover:text-white {% if active_tab == 'media' %}text-white font-medium{% endif %}">Media</a>
     <a href="/storage" class="text-gray-300 hover:text-white {% if active_tab == 'storage' %}text-white font-medium{% endif %}">Storage</a>
     <a href="/download/client" class="text-gray-300 hover:text-white" title="Download CLI client">Client</a>