Accept PathLike local destinations in synchronous get

[adenzhou1350]

Fixes #896.

get(remote_path, pathlib.Path(local_path)) raises TypeError: object of type 'Path' has no len() because a scalar PathLike destination reaches other_paths as though it were a destination list.

Pass os.PathLike destinations through the existing make_path_posix normalization, just as string destinations already are. Lists retain their existing behavior. The real async _get already normalizes PathLike destinations and needs no change.

Regression coverage uses the public memory filesystem get with strings, pathlib and a custom __fspath__ object: renamed files, existing directories, globs, source lists, explicit destination lists and recursive copies with/without trailing slashes.

Validation against master 94afb3f6:

• Matched Windows Python 3.14 and Linux Python 3.12 regression runs: before 10 failed / 8 passed; after 18 passed on each OS.
• Related memory/local/spec/utility/callback and bulk-copy suites: Windows 945 passed, 128 skipped, 10 xfailed, 2 failures, 4 setup errors; Linux 1044 passed, 28 skipped, 1 xfailed, 4 setup errors. The remaining failures/errors occur unchanged on the baseline: Windows cannot create the test's | filenames, and both environments lack the mocker fixture. No newly failing test names.
• Separate native relative/absolute destination checks confirm the async base implementation already passes and the sync implementation passes after this change.
• Diff check passes. Lint, the complete upstream dependency/OS matrix and cloud integrations were not run locally.

AI-assisted; independently reproduced through the actual filesystem implementation, not an extracted helper or mocked import.