Add comprehensive API documentation for ThrillWiki integration and features

- Introduced Next.js integration guide for ThrillWiki API, detailing authentication, core domain APIs, data structures, and implementation patterns.
- Documented the migration to Rich Choice Objects, highlighting changes for frontend developers and enhanced metadata availability.
- Fixed the missing `get_by_slug` method in the Ride model, ensuring proper functionality of ride detail endpoints.
- Created a test script to verify manufacturer syncing with ride models, ensuring data integrity across related models.

backend/apps/api/v1/views/stats.py

@@ -250,7 +250,10 @@ class StatsAPIView(APIView):
                 "RELOCATED": "relocated_parks",
             }
 
-            status_name = status_names.get(status_code, f"status_{status_code.lower()}")
+            if status_code in status_names:
+                status_name = status_names[status_code]
+            else:
+                raise ValueError(f"Unknown park status: {status_code}")
             park_status_stats[status_name] = status_count
 
         # Ride status counts