Add Z-Level Manager, a basic admin tool. (#30397)

* Add Z-Level Manager, a basic admin tool.

* build bundle, use ui_module/admin

* fix type restriction

* remove unnecessary params

code/modules/space_management/space_level.dm

@@ -200,3 +200,34 @@ GLOBAL_LIST_INIT(cable_typecache, typecacheof(/obj/structure/cable))
 	transition_border_east = (world.maxx - 4)
 	transition_border_south = 3
 	transition_border_west = 3
+
+// space levels have no UI of their own so borrowing this proc for serialization
+// for other UIs
+/datum/space_level/ui_data(mob/user)
+	. = list(
+		"name" = name,
+		"zpos" = zpos,
+		"linkage" = linkage,
+		"transition_tag" = transition_tag,
+		"traits" = flags,
+	)
+
+	.["neighbors"] = list()
+	for(var/direction in list(Z_LEVEL_SOUTH, Z_LEVEL_NORTH, Z_LEVEL_EAST, Z_LEVEL_WEST))
+		var/datum/space_level/neighbor = get_connection(direction)
+		if(neighbor)
+			var/dirname = dir2text(text2num(direction))
+			.["neighbors"][dirname] = neighbor.zpos
+
+	.["ruins"] = list()
+	for(var/obj/effect/landmark/ruin/ruin_landmark in GLOB.ruin_landmarks)
+		if(ruin_landmark.z == zpos)
+			.["ruins"] += list(list(
+				"name" = ruin_landmark.ruin_template.name,
+				"mappath" = ruin_landmark.ruin_template.mappath,
+				"coords" = list(
+					"x" = ruin_landmark.x,
+					"y" = ruin_landmark.y,
+					"z" = ruin_landmark.z,
+				),
+			))