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feat: add ExtendableEventMap helper for type-safe custom events (#16)

- Add second generic parameter TEventMap to Component class
- Implement ExtendableEventMap type that merges lifecycle events with custom events
- Add NoLifecycleKeys type to prevent event name conflicts at compile time
- Update emit(), on(), once(), and off() methods to use TEventMap
- Add comprehensive documentation with examples and warnings
- Add tests for custom events including type checking and conflict detection

The new ExtendableEventMap helper allows users to extend the event system
with application-specific events while maintaining full type safety and
preventing accidental conflicts with lifecycle event names (initialized,
attached, disposed, destroyed).

Implements #8

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