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

selective-vpn-gui/main_window/singbox/runtime_mixin.py

@@ -0,0 +1,16 @@
+from __future__ import annotations
+
+from main_window.singbox.runtime_cards_mixin import SingBoxRuntimeCardsMixin
+from main_window.singbox.runtime_profiles_mixin import SingBoxRuntimeProfilesMixin
+from main_window.singbox.runtime_transport_mixin import SingBoxRuntimeTransportMixin
+
+
+class SingBoxRuntimeMixin(
+    SingBoxRuntimeProfilesMixin,
+    SingBoxRuntimeTransportMixin,
+    SingBoxRuntimeCardsMixin,
+):
+    """Facade mixin for SingBox runtime/profile actions."""
+
+
+__all__ = ["SingBoxRuntimeMixin"]