feat: Redesign web interface with 5 static tabs

Redesigned the web interface with a cleaner 5-tab layout:
- Accueil: Recommendations + Latest releases mixed
- Recherche: Unified search for anime and series
- Anime: Latest anime releases
- Série: Latest series releases
- Fournisseurs: Provider list with file hosts

Technical changes:
- Created new tabs.js for Anime, Série, and Fournisseurs tabs
- Modified header.html to use static tabs instead of dynamic
- Fixed carousel CSS classes in home_section.html
- Added null checks in main.js to prevent JS errors
- Simplified loadProviders() for legacy support
- All functionality preserved and working

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

templates/components/home_section.html

@@ -14,7 +14,7 @@
                 Actualiser
             </button>
         </div>
-        <div id="recommendationsList" class="search-results"></div>
+        <div id="recommendationsList" class="recommendations-carousel"></div>
     </div>
 
     <!-- Latest Releases Section -->
@@ -28,6 +28,6 @@
                 Actualiser
             </button>
         </div>
-        <div id="releasesList" class="search-results"></div>
+        <div id="releasesList" class="releases-carousel"></div>
     </div>
 </div>