- Add ProactiveInitializerFinder to search for initializers when not found in registry
- Add InitializerInfo value object to store initializer metadata
- Implement multi-step search strategy: DefaultImplementation, naming convention, directory, subdirectories, module
- Integrate proactive finder into DefaultContainer for better interface resolution
- Simplify AppBootstrapper by moving initialization logic to DefaultContainer
- Improve error messages in ClassNotInstantiable with proactive finder context
