Widen type annotation for _ensure_target_output_writable to Sequence[str | os.PathLike]

[Copilot]

The parameter annotation for _ensure_target_output_writable was List[str], which misrepresents real callers like ParameterManager.get_target_filenames() that pass Path objects.

Changes

• pyptv/ptv.py: Updated annotation from List[str] → Sequence[str | os.PathLike]; added Sequence to typing imports

# Before
def _ensure_target_output_writable(short_file_bases: List[str]) -> None:

# After
def _ensure_target_output_writable(short_file_bases: Sequence[str | os.PathLike]) -> None:

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