Remove NoTransientInstancesOfPersistentClass conditional define

[bero]

Summary

The NoTransientInstancesOfPersistentClass conditional define should be removed and the check should always be enforced.

Background

Currently, creating transient instances of persistent classes is conditionally prevented via {$IFDEF NoTransientInstancesOfPersistentClass} in BoldSystem.pas. This define is enabled under the Attracs configuration but disabled otherwise.

Problem

There is no valid use case for creating transient instances of persistent classes:

• Temporary objects can use undo/rollback or separate DTO classes
• Preview/simulation scenarios should use separate in-memory systems
• Template objects can be stored in DB or use non-persistent classes

The conditional define:

• Implies the feature might be useful (it isn't)
• Allows bugs in builds without the define
• Adds unnecessary complexity
• The AddTransientFromSystem procedure in BoldObjectListControllers.pas becomes dead code

Proposed Solution

1. Remove {$DEFINE NoTransientInstancesOfPersistentClass} from Bold.inc
2. Remove {$UNDEF NoTransientInstancesOfPersistentClass} from non-Attracs block
3. Make the check in BoldSystem.pas unconditional
4. Remove dead code AddTransientFromSystem from BoldObjectListControllers.pas
5. Update tests that relied on this feature