feat(rides): populate slugs for existing RideModel records and ensure uniqueness

- Added migration 0011 to populate unique slugs for existing RideModel records based on manufacturer and model names.
- Implemented logic to ensure slug uniqueness during population.
- Added reverse migration to clear slugs if needed.

feat(rides): enforce unique slugs for RideModel

- Created migration 0012 to alter the slug field in RideModel to be unique.
- Updated the slug field to include help text and a maximum length of 255 characters.

docs: integrate Cloudflare Images into rides and parks models

- Updated RidePhoto and ParkPhoto models to use CloudflareImagesField for image storage.
- Enhanced API serializers for rides and parks to support Cloudflare Images, including new fields for image URLs and variants.
- Provided comprehensive OpenAPI schema metadata for new fields.
- Documented database migrations for the integration.
- Detailed configuration settings for Cloudflare Images.
- Updated API response formats to include Cloudflare Images URLs and variants.
- Added examples for uploading photos via API and outlined testing procedures.

backend/apps/parks/models/parks.py

@@ -54,6 +54,24 @@ class Park(TrackedModel):
     ride_count = models.IntegerField(null=True, blank=True)
     coaster_count = models.IntegerField(null=True, blank=True)
 
+    # Image settings - references to existing photos
+    banner_image = models.ForeignKey(
+        "ParkPhoto",
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name="parks_using_as_banner",
+        help_text="Photo to use as banner image for this park"
+    )
+    card_image = models.ForeignKey(
+        "ParkPhoto",
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name="parks_using_as_card",
+        help_text="Photo to use as card image for this park"
+    )
+
     # Relationships
     operator = models.ForeignKey(
         "Company",