Fix: Fix RT-TDDFT segmentation fault caused by unconverged initial SCF

[AsTonyshment]

Description

This PR fixes a critical segmentation fault in the RT-TDDFT module when the initial Ground State SCF calculation fails to converge within the specified scf_nmax.

Issue & Root Cause

Scenario:

1. User sets a small scf_nmax.
2. The initial GS SCF loop finishes without convergence (conv_esolver is false).
3. The code proceeds to the first time-dependent evolution step.
4. Crash: The program segfaults in Evolve_elec::solve_psi when accessing psi_laststep.

Root Cause:
In source/source_esolver/esolver_ks_lcao_tddft.cpp, the function store_h_s_psi (responsible for allocating and saving psi_laststep, Hk_laststep, Sk_laststep) was only called if conv_esolver was true.
When SCF failed to converge, psi_laststep remained a nullptr. Subsequently, calling psi_laststep->fix_k(ik) in the next step triggered a segmentation fault.

Fix

Modified ESolver_KS_LCAO_TDDFT::iter_finish to allow storing the wavefunction and Hamiltonian/Overlap matrices even if convergence is not reached, provided the iteration count has hit the limit (iter == this->maxniter).