feat: add remap_divref tool

[ameynert]

Summary

• Ports remap_divref.py (calitas subcommand) from human-diversity-reference/scripts as a defopt-compatible toolkit tool
• Remaps DivRef haplotype-space coordinates to reference genome positions for CALITAS output files, using the DivRef DuckDB index produced by create_fasta_and_index
• Adds full type annotations, Pydantic frozen=True models (Variant, ReferenceMapping, Haplotype) with field aliases for DB column names, and replaces typer error handling with RuntimeError/ValueError
• Adds pandas to the mypy ignore_missing_imports override
• Fixes coordinate translation to match upstream v1.1: sign-dependent check in _translate_coordinate_to_ref and gap-stripping in padded_len_adj
• Adds tests/tools/test_remap_divref.py with six tests covering coordinate translation, gap handling, and haplotype remapping; all pass

Test plan

• uv run --directory divref poe check-all passes
• uv run --directory divref pytest tests/tools/test_remap_divref.py — all six tests pass

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