Refactor setup Git remote parsing helpers

[codeforester]

Summary

• extract Git remote URL parsing/model/detail helpers into base_setup.git_remote_parse
• keep parser compatibility exports available from base_setup.git_remote
• add parser-module tests for compatibility exports, credential sanitization, and local path resolution

Validation

• PYTHONPATH=lib/python:cli/python $HOME/.base.d/base/.venv/bin/python -m pytest cli/python/base_setup/tests/test_git_remote_parse.py -q
• PYTHONPATH=lib/python:cli/python $HOME/.base.d/base/.venv/bin/python -m pytest cli/python/base_setup/tests/test_git_remote.py -q
• PYTHONPATH=lib/python:cli/python $HOME/.base.d/base/.venv/bin/python -m pytest cli/python/base_setup/tests/test_manifest_checks.py cli/python/base_setup/tests/test_git_remote.py cli/python/base_setup/tests/test_git_remote_parse.py -q
• PYTHONPATH=lib/python:cli/python $HOME/.base.d/base/.venv/bin/python -m pytest cli/python/base_setup/tests -q
• PYTHONPATH=lib/python:cli/python $HOME/.base.d/base/.venv/bin/python -m pylint cli/python/base_setup/git_remote.py cli/python/base_setup/git_remote_parse.py cli/python/base_setup/tests/test_git_remote.py cli/python/base_setup/tests/test_git_remote_parse.py
• python3 -m compileall -q cli/python/base_setup/git_remote.py cli/python/base_setup/git_remote_parse.py cli/python/base_setup/tests/test_git_remote_parse.py
• git diff --check

Closes #1466