feat(tf2): align optimizer dispatch with the common schema

TF backend loss: exclude mixed_type padding atoms (per-frame normalization)

[BUG] Source installation with PyTorch + CUDA backend fails due to undocumented build-system dependencies and incomplete CUDA path detection

[Code scan] Honor TensorFlow change-bias --numb-batch

[Code scan] Use the LAMMPS communicator instead of MPI_COMM_WORLD

[Bug] DPA-2.4-7M checkpoint cannot be loaded by deepmd-kit v3.1.3 (registered in pretrained registry but incompatible)

Add `dp property repr` MVP for representation extraction

Add `dp property predict` MVP for high-level property inference

[Feature Request] Last layer feature (latent feature) output in deepmd-kit function or CLI

[BUG] : converting to JAX results in segmentation fault