refactor: construct application layers from supplied sources

src/app/layers/cctv.js

@@ -0,0 +1,30 @@
+import { createCctvLayer } from '../../layers/cctv/index.js';
+import * as sprites from '../../data/spriteOrder.js';
+import * as activation from '../../cctvFocusRequest.js';
+import * as overlays from '../../overlays/worldOverlay.js';
+import * as locations from '../../locations.js';
+import * as picking from '../../data/pickRegistry.js';
+import * as terrain from '../../data/terrainHeights.js';
+import * as ground from '../../data/groundFloor.js';
+import * as mesh from '../../data/meshFloorSampler.js';
+import * as focus from '../../data/focusDeemphasis.js';
+import * as render from '../../renderGovernor.js';
+
+/** Construct one layer using the application scene owners and a supplied source. */
+export function createApplicationCctv({ source }) {
+  return createCctvLayer({
+    source,
+    services: {
+      sprites,
+      activation,
+      overlays,
+      locations,
+      picking,
+      terrain,
+      ground,
+      mesh,
+      focus,
+      render,
+    },
+  });
+}