Add framework-agnostic locale management

Added LocaleManagerInterface for framework-specific locale handling
Language switching now automatically updates framework locale
Improved internal architecture for better framework independence

Breaking Changes
None. This release is fully backwards compatible with v1.0.x
Benefits

Simplified framework integration
More consistent locale management across different frameworks
Cleaner separation of concerns between language and locale management
Better testability with clear interfaces

For Framework Implementation Developers
Now you can implement locale changes in a framework-specific way by creating your own LocaleManagerInterface implementation