Add research lab planets and research points (#63)

PlanetDefinition.gd

@@ -8,3 +8,7 @@ extends Resource
 @export var surface_profile_id: String = "rocky"
 @export var resource_id: String = "ore"
 @export var map_color: Color = Color(0.7, 0.65, 0.55)
+# Optional reward granted once when every authored capture point is claimed.
+# Keeping it on the definition lets conquest remain generic as new planet
+# rewards are introduced.
+@export var conquest_research_points: int = 0