Test: Add <phi|r_a|p_{l,m}> snap_psibeta unit test

[AsTonyshment]

Summary

This PR strengthens the RT-TDDFT velocity-gauge beta-projector snapshot coverage by comparing snap_psibeta_half_tddft against the existing cal_r_overlap_R two-center reference path for both the projector overlap and the Cartesian position moments.

Changes

• Extend the snap_psibeta_half_tddft unit test to use real Ti orbital and UPF beta-projector data instead of synthetic beta projectors.
• Compare the zero-vector-potential results for:
  • nlm[0] = <phi|p_{l,m}>
  • nlm[1..3] = <phi|r_a|p_{l,m}>
• Cover the production quadrature settings, a denser radial grid, and a higher-order Lebedev angular grid.
• Make the shared projector snapshot interface explicit about the r * p_l(r) radial-projector convention used by UPF beta projectors.
• Update the radial quadrature factor so the shared integrator evaluates the intended p_l(r) * r^2 dr volume-integral contribution from stored r * p_l(r) data.
• Register the extra source dependencies needed by the focused test target.
• Make cal_r_overlap_R orbital-index maps robust when a test-built UnitCell has more orbitals than PARAM.globalv.nlocal.

Verification

Not run while drafting this PR text.

Recommended focused check:

ctest --test-dir build -R '^MODULE_LCAO_tddft_snap_psibeta_half_test$' --output-on-failure

INPUT And Documentation

No INPUT parameter behavior is changed, so docs/parameters.yaml and docs/advanced/input_files/input-main.md do not need updates.

Notes For Reviewers

• The numerical reference is generated through cal_r_overlap_R::get_psi_r_beta, so the test now checks the same physical Ti UPF beta projectors used by the production nonlocal setup path.
• The imaginary parts are expected to vanish at zero vector potential and are checked separately from the real-valued reference comparisons.