feat: Enhance Adventure and Collection Management

- Added support for multiple collections in AdventureSerializer, allowing adventures to be linked to multiple collections.
- Implemented validation to ensure collections belong to the current user during adventure creation and updates.
- Introduced a signal to update adventure publicity based on the public status of linked collections.
- Updated file permission checks to consider multiple collections when determining access rights.
- Modified AdventureImageViewSet and AttachmentViewSet to check access against collections instead of a single collection.
- Enhanced AdventureViewSet to support filtering and sorting adventures based on collections.
- Updated frontend components to manage collections more effectively, including linking and unlinking adventures from collections.
- Adjusted API endpoints and data structures to accommodate the new collections feature.
- Improved user experience with appropriate notifications for collection actions.

backend/server/adventures/apps.py

@@ -1,6 +1,8 @@
 from django.apps import AppConfig
-from django.conf import settings
 
 class AdventuresConfig(AppConfig):
     default_auto_field = 'django.db.models.BigAutoField'
-    name = 'adventures'
+    name = 'adventures'
+    
+    def ready(self):
+        import adventures.signals  # Import signals when the app is ready