chore(core): release v2.2.21
- 优化 HierarchySystem 性能 (#279) - 更新 changelog
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## v2.2.21 (2025-12-05)
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### Performance
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- **HierarchySystem 性能优化**: 优化层级系统避免每帧遍历所有实体 (#279)
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- 使用脏实体集合代替每帧遍历所有实体
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- 静态场景下 `process()` 从 O(n) 优化为 O(1)
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- 1000 实体静态场景: 81.79μs → 0.07μs (快 1168 倍)
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- 10000 实体静态场景: 939.43μs → 0.56μs (快 1677 倍)
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- 服务端模拟 (100房间 x 100实体): 2.7ms → 1.4ms 每 tick
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## v2.2.20 (2025-12-04)
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### Bug Fixes
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