Fix module_hs sparse output controls

[goodchong]

Summary

• stabilize module_hs sparse CSR threshold counting and r(R) header generation
• wire out_mat_t/dh/ds/r precision options into sparse writers while preserving legacy defaults
• add regression coverage for dH/dS sparse CSR, SOC directions, r(R) finalization, and single-R precision

Tests

• git diff --check
• g++ -std=c++11 -Isource -c source/source_io/module_hs/rr_sparse_writer.cpp -o /tmp/rr_sparse_writer.o
• g++ -std=c++11 -Isource -c source/source_io/module_hs/single_R_io.cpp -o /tmp/single_R_io.o
• docker run ghcr.io/deepmodeling/abacus-gnu:latest cmake --build build-ci-nodftd4 -j8
• docker run ghcr.io/deepmodeling/abacus-gnu:latest ctest --test-dir build-ci-nodftd4 -V -R "MODULE_IO_single_R_test|MODULE_IO_write_hs_r_compat_test|MODULE_IO_restart_exx_csr_test"

Note: local Docker validation used the GNU CI image with ENABLE_DFTD4=OFF because the local container image did not have xz available for bootstrapping dftd4.

[mohanchen]

please use g++ -std=c++11 instead of g++ -std=c++17