Add Spotify integration with improved token management and user interface

- Implemented Spotify OAuth handling in spotify_client_manager.py to ensure valid access tokens for users.
- Created helper functions in spotify_helper.py for refreshing tokens and retrieving user information.
- Developed manage_spotify.html template for connecting and managing Spotify accounts, displaying connection status and token information.
- Added logging for token management processes to enhance debugging and monitoring.
- Introduced a debug client for Spotify interactions to facilitate easier testing and development.

musicround/templates/users/audio_settings.html

@@ -9,12 +9,6 @@
         <p class="text-gray-600">Upload or generate your own intro, outro, and replay announcements for quizzes.</p>
     </div>
     
-    {% for category, message in get_flashed_messages(with_categories=true) %}
-    <div class="mb-6 p-4 rounded {% if category == 'danger' %}bg-red-50 text-red-700 border border-red-300{% elif category == 'success' %}bg-green-50 text-green-700 border border-green-300{% else %}bg-blue-50 text-blue-700 border border-blue-300{% endif %}">
-        {{ message }}
-    </div>
-    {% endfor %}
-    
     <!-- Intro Audio Section -->
     <div class="bg-white rounded-lg shadow-md overflow-hidden mb-8">
         <div class="bg-navy-50 p-4 border-b">