Update dp_v3.md

Author: yaniguan

source/_posts/dp_v3.md

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 ## 1. Multi-backend framework: Powered by TensorFlow, PyTorch, and JAX
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 <center><img src=https://dp-public.oss-cn-beijing.aliyuncs.com/community/dpv3/dp1.png# pic_center width="100%" height="100%" /></center>
 
 DeePMD-kit v3 implements a flexible and pluggable backend framework, providing a consistent training and inference experience across multiple backends. Version 3.0.0 includes the following backends:
 
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 - **TensorFlow Backend**: Static graph for efficient computation.  
 - **PyTorch Backend**: Dynamic graph, simplifying model extension and development.  
 - **DP Backend**: Reference backend implemented with NumPy and Array API.