fix: skip invalid/unresolvable SSH targets before connect (0.11.2)

Do not use human display_name as SSH host; skip short names that do not resolve on SAC (ubabuba -> IPv4 only).

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 == "0.11.1"
+    assert APP_VERSION == "0.11.2"
     assert APP_NAME == "Security Alert Center"
-    assert APP_VERSION_LABEL == "Security Alert Center v.0.11.1"
+    assert APP_VERSION_LABEL == "Security Alert Center v.0.11.2"