platform: modularize api/gui, add docs-tests-web foundation, and refresh root config

selective-vpn-gui/main_window/runtime_actions_mixin.py

@@ -0,0 +1,18 @@
+from __future__ import annotations
+
+from main_window.runtime_auth_mixin import RuntimeAuthMixin
+from main_window.runtime_ops_mixin import RuntimeOpsMixin
+from main_window.runtime_refresh_mixin import RuntimeRefreshMixin
+from main_window.runtime_state_mixin import RuntimeStateMixin
+
+
+class MainWindowRuntimeActionsMixin(
+    RuntimeOpsMixin,
+    RuntimeAuthMixin,
+    RuntimeRefreshMixin,
+    RuntimeStateMixin,
+):
+    """Facade mixin for backward-compatible MainWindow inheritance."""
+
+
+__all__ = ["MainWindowRuntimeActionsMixin"]