feat: implement video job management with retry and delete functionality, enhance video generation status tracking

Co-authored-by: Copilot <copilot@github.com>

frontend/app/templates/video_detail.html

@@ -12,11 +12,11 @@ block content %}
   <div class="bg-gray-800 rounded-lg shadow-lg overflow-hidden">
     {% if video.status == 'completed' and video.video_url %}
     <video src="{{ video.video_url }}" controls class="w-full"></video>
-    {% elif video.status in ('queued', 'processing') and video.polling_url %}
+    {% elif video.status in ('queued', 'processing') %}
     <div
       class="w-full bg-black aspect-video flex flex-col items-center justify-center p-6 text-center"
       id="video-poll-status"
-      data-polling-url="{{ video.polling_url }}"
+      data-video-id="{{ video.id }}"
     >
       <p class="text-xl font-semibold">
         Status: <strong id="poll-status-text">{{ video.status }}</strong>