Enable CelestialVault + DaySequence plugins (night sky / star rendering)

Pairs with ralpha f18a7095d: the night-sky handlers control a
CelestialVaultDaySequenceActor via reflection, which only exists when the
CelestialVault plugin is loaded. Without these enabled, set_night_sky rendered
a black frame. DaySequence is CelestialVault's time-of-day dependency.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Ralpha.uproject

@@ -89,6 +89,14 @@
 		{
 			"Name": "MetaHumanCharacter",
 			"Enabled": true
+		},
+		{
+			"Name": "DaySequence",
+			"Enabled": true
+		},
+		{
+			"Name": "CelestialVault",
+			"Enabled": true
 		}
 	]
 }