feat: fix auth, provider health checks, search, and redesign UI

- Fix register/login: dict-style access on UserTable ORM objects
- Fix HTMX auth: inject JWT token in all HTMX request headers
- Fix FS7 search: use DLE AJAX endpoint /engine/ajax/search.php
- Fix ZT search: use ?p=series&search=QUERY (not DLE format)
- Fix provider health: load hardcoded providers + domain manager
- Add self.id to all anime/series providers
- Redesign homepage: Netflix-style horizontal scroll cards (.hc)
- Redesign search results: grouped by title, poster + synopsis + 3 buttons
- Add Télécharger dropdown: season download + episode picker
- Fix navbar CSS: restore .tabs flex layout, remove orphan rules
- Fix HTMX spinner: remove inline display:none, use CSS indicator
- Add AGENTS.md files across project for developer documentation

templates/components/home_section.html

@@ -1,9 +1,5 @@
-<!-- Home Section: Premium Layout -->
 <div id="tab-home" class="tab-content" x-show="activeTab === 'home'">
-    
-    <!-- Hero / Featured area could go here later -->
 
-    <!-- Recommendations Row -->
     <div class="section-container">
         <div class="section-header">
             <h2>🎯 Recommandé pour vous</h2>
@@ -16,12 +12,11 @@
         <div id="recommendationsList" 
              hx-get="/api/recommendations" 
              hx-trigger="load delay:100ms" 
-             class="streaming-row">
-            <div class="loading-spinner"></div>
+             class="home-row">
+            <div class="loading-placeholder"><div class="spinner"></div></div>
         </div>
     </div>
 
-    <!-- Latest Releases Row -->
     <div class="section-container">
         <div class="section-header">
             <h2>🔥 Dernières sorties</h2>
@@ -34,8 +29,8 @@
         <div id="releasesList" 
              hx-get="/api/releases/latest" 
              hx-trigger="load delay:300ms" 
-             class="streaming-row">
-            <div class="loading-spinner"></div>
+             class="home-row">
+            <div class="loading-placeholder"><div class="spinner"></div></div>
         </div>
     </div>
 </div>