M3 namespace migration: complete Phase B, partial Phase D, docs and tests

- Native runtime under bearhub/ (api, commons, gems, view/util, view/core, view/qt)
- bauh/ compatibility re-export shims for legacy imports
- Phase D: canonical __version__/__app_name__ in bearhub/__init__.py; pyproject.toml
  and setup.py point at bearhub package
- Native gem loader at bearhub/view/core/gems.py
- Namespace compatibility tests (159 tests passing)
- Documentation: CHANGELOG [Unreleased], NAMESPACE_MIGRATION, ROADMAP, README,
  CONTRIBUTING, docs/qt6-migration.md, packaging/aur/README.md

bauh/view/qt/__init__.py

@@ -0,0 +1 @@
+from bearhub.view.qt import *  # noqa: F401,F403

bauh/view/qt/about.py

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+from bearhub.view.qt.about import *  # noqa: F401,F403

bauh/view/qt/apps_table.py

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+from bearhub.view.qt.apps_table import *  # noqa: F401,F403

bauh/view/qt/commons.py

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+from bearhub.view.qt.commons import *  # noqa: F401,F403

bauh/view/qt/components.py

@@ -0,0 +1 @@
+from bearhub.view.qt.components import *  # noqa: F401,F403

bauh/view/qt/dialog.py

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+from bearhub.view.qt.dialog import *  # noqa: F401,F403

bauh/view/qt/history.py

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+from bearhub.view.qt.history import *  # noqa: F401,F403

bauh/view/qt/info.py

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+from bearhub.view.qt.info import *  # noqa: F401,F403

bauh/view/qt/prepare.py

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+from bearhub.view.qt.prepare import *  # noqa: F401,F403

bauh/view/qt/qt_utils.py

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+from bearhub.view.qt.qt_utils import *  # noqa: F401,F403

bauh/view/qt/root.py

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+from bearhub.view.qt.root import *  # noqa: F401,F403

bauh/view/qt/screenshots.py

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+from bearhub.view.qt.screenshots import *  # noqa: F401,F403

bauh/view/qt/settings.py

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+from bearhub.view.qt.settings import *  # noqa: F401,F403

bauh/view/qt/systray.py

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+from bearhub.view.qt.systray import *  # noqa: F401,F403

bauh/view/qt/thread.py

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+from bearhub.view.qt.thread import *  # noqa: F401,F403

bauh/view/qt/view_index.py

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+from bearhub.view.qt.view_index import *  # noqa: F401,F403

bauh/view/qt/view_model.py

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+from bearhub.view.qt.view_model import *  # noqa: F401,F403

bauh/view/qt/window.py

@@ -0,0 +1 @@
+from bearhub.view.qt.window import *  # noqa: F401,F403