feat: Implement avatar upload system with Cloudflare integration

- Added migration to transition avatar data from CloudflareImageField to ForeignKey structure in UserProfile.
- Fixed UserProfileEvent avatar field to align with new avatar structure.
- Created serializers for social authentication, including connected and available providers.
- Developed request logging middleware for comprehensive request/response logging.
- Updated moderation and parks migrations to remove outdated triggers and adjust foreign key relationships.
- Enhanced rides migrations to ensure proper handling of image uploads and triggers.
- Introduced a test script for the 3-step avatar upload process, ensuring functionality with Cloudflare.
- Documented the fix for avatar upload issues, detailing root cause, implementation, and verification steps.
- Implemented automatic deletion of Cloudflare images upon avatar, park, and ride photo changes or removals.

backend/apps/moderation/models.py

@@ -646,7 +646,11 @@ class PhotoSubmission(TrackedModel):
     content_object = GenericForeignKey("content_type", "object_id")
 
     # The photo itself
-    photo = models.ImageField(upload_to="submissions/photos/")
+    photo = models.ForeignKey(
+        'django_cloudflareimages_toolkit.CloudflareImage',
+        on_delete=models.CASCADE,
+        help_text="Photo submission stored on Cloudflare Images"
+    )
     caption = models.CharField(max_length=255, blank=True)
     date_taken = models.DateField(null=True, blank=True)