docs: agent control plane concept (v0.9.12)

Утверждённая концепция v0.7: RDG flap, qwinsta/logoff, обновления
агентов и desired config. Только документация и bump версии — runtime
без изменений.

backend/app/version.py

@@ -1,5 +1,5 @@
 """Единый источник версии SAC (API, health, логи, OpenAPI)."""
 
 APP_NAME = "Security Alert Center"
-APP_VERSION = "0.9.11"
+APP_VERSION = "0.9.12"
 APP_VERSION_LABEL = f"{APP_NAME} v.{APP_VERSION}"

backend/tests/test_health.py

@@ -4,6 +4,6 @@ from app.version import APP_NAME, APP_VERSION, APP_VERSION_LABEL
 
 
 def test_version_constants():
-    assert APP_VERSION == "0.9.11"
+    assert APP_VERSION == "0.9.12"
     assert APP_NAME == "Security Alert Center"
-    assert APP_VERSION_LABEL == "Security Alert Center v.0.9.11"
+    assert APP_VERSION_LABEL == "Security Alert Center v.0.9.12"