Implement basic C# and VB Application Builder templates

## Objective

Create equivalent basic templates using the approved builder, lifetime, DI, configuration, logging, and settings contracts. Keep generated code approachable, Designer-compatible, trimming-aware where supported, and free of unnecessary enterprise complexity.

## Completion guidance

- Keep the implementation focused on the objective while allowing the assignee to improve the approach based on research.
- Document important decisions, rejected alternatives, dependencies, and follow-up work.
- Add or update tests and documentation appropriate to the work.
- Verify locally and in CI where the task changes code or generated artifacts.

Start by researching the existing WinForms template structure and the approved builder, lifetime, DI, configuration, logging, and settings contracts mentioned in the objective. Done means equivalent basic C# and VB templates exist, remain approachable, Designer-compatible, and trimming-aware where supported, with appropriate tests, documentation, and local or CI verification.

Written by the indexing model from the issue text.