Add Day 10: Emergent Abilities

Sync: 同步Day9中文版今日所有更新（6ND解释、优化器、架构独立性、JEPA讨论）

Add: JEPA latent space压缩与representation collapse的延伸讨论

Add: 补充架构独立性问题的详细解释(Mamba/RWKV与Scaling Law的关系)

Fix: 修复LaTeX行内公式渲染乱码问题

Fix: 补充解释C≈6ND中乘D的含义

feat: add Day 11 Pre-training Basics with comprehensive optimizer section

Add: 解释C≈6ND中2和3的含义及优化器对系数的影响

docs: add detailed explanation of inference-time scaling formula

docs: expand Data Wall section with four research directions

docs: add detailed explanations for Zipf's law and fractal loss landscape

fix: remove unsupported LaTeX line spacing in scaling laws formulas

Add Day 9: Scaling Laws

Rename onehot-to-dense.png to v2 to force cache refresh

Day 8: Improve onehot-to-dense figure with sparse vs dense comparison