Add initial migration for moderation app and resolve seed command issues

- Created an empty migration file for the moderation app to enable migrations.
- Documented the resolution of the seed command failure due to missing moderation tables.
- Identified and fixed a VARCHAR(10) constraint violation in the User model during seed data generation.
- Updated role assignment in the seed command to comply with the field length constraint.

apps/rides/models/__init__.py

@@ -8,7 +8,7 @@ The Company model is aliased as Manufacturer to clarify its role as ride manufac
 while maintaining backward compatibility through the Company alias.
 """
 
-from .rides import Ride, RideModel, RollerCoasterStats
+from .rides import Ride, RideModel, RideModelVariant, RideModelPhoto, RideModelTechnicalSpec, RollerCoasterStats
 from .company import Company
 from .location import RideLocation
 from .reviews import RideReview
@@ -19,6 +19,9 @@ __all__ = [
     # Primary models
     "Ride",
     "RideModel",
+    "RideModelVariant",
+    "RideModelPhoto",
+    "RideModelTechnicalSpec",
     "RollerCoasterStats",
     "Company",
     "RideLocation",