fix: recognize Python compatibility import entry points

[ApexWorm]

Problem

Python orphan detection only followed literal importlib.import_module calls. It therefore flagged physical install_legacy_module_alias(name, canonical) wrappers and child modules selected from a static lazy package export map as orphaned despite their runtime import contracts.

Fix

• Treat top-level explicit legacy-module-alias wrappers as import entry points.
• Follow from-importlib import_module bindings and literal getattr lazy-export maps of the form f"{name}.{module_name}".
• Add focused detector and integration regressions.

Verification

• python -m pytest -q -p no:cacheprovider -o addopts='' desloppify/languages/python/tests/test_py_deps.py desloppify/tests/detectors/test_orphaned.py (84 passed)
• ruff check and format checks on changed files
• Direct detector checks against the downstream MonoRepo no longer report its invite-code lazy export or two explicit contracts compatibility aliases.