* docs: add editor-app README with setup instructions
* docs: add separate EN/CN editor setup guides
* feat(ecs): add @NetworkEntity decorator for auto spawn/despawn broadcasting
- Add @NetworkEntity decorator to mark components for automatic network broadcasting
- ECSRoom now auto-broadcasts spawn on component:added event
- ECSRoom now auto-broadcasts despawn on entity:destroyed event
- Entity.destroy() emits entity:destroyed event via ECSEventType
- Entity active state changes emit ENTITY_ENABLED/ENTITY_DISABLED events
- Add enableAutoNetworkEntity config option to ECSRoom (default true)
- Update documentation for both Chinese and English
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