[Code scan] Add the missing h5py dependency for the DeepH example

[njzjz]

This issue comes from a Codex global scan of deepmodeling/tbplas at commit 4d3652b.

Severity: Low

The DeepH interface example imports h5py, but the install documentation lists only ase and mpi4py as optional packages. Users following the docs can hit ModuleNotFoundError when running the example.

Code references:

tbplas/examples/interface/deeph/read_deeph.py

Line 19 in 4d3652b

import h5py

tbplas/doc/source/install.rst

Lines 53 to 56 in 4d3652b

	And the following packages as optional:
	* ase (for LAMMPS interface)
	* mpi4py (for hybrid MPI+OpenMP parallelization)

https://github.com/deepmodeling/tbplas/blob/4d3652b3dba8eb930e4869a6d41074f62d703692/INSTALL.rst#L53-L56

Suggested fix: add an optional dependency group for the DeepH interface or document h5py alongside the other optional packages.