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/manage.py

@@ -10,7 +10,7 @@ def main():
     """Run administrative tasks."""
     # Auto-detect environment based on command line arguments and environment variables
     settings_module = detect_settings_module()
-    config("DJANGO_SETTINGS_MODULE", settings_module)
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", settings_module)
 
     try:
         from django.core.management import execute_from_command_line
@@ -21,7 +21,7 @@ def main():
             "Did you forget to activate a virtual environment?"
         )
         print("\nTo set up your development environment, try:")
-        print("  python manage.py setup_dev")
+        print("  uv run manage.py setup_dev")
         raise ImportError(
             "Couldn't import Django. Are you sure it's installed and "
             "available on your PYTHONPATH environment variable? Did you "