refactor: construct application layers from supplied sources

src/standalone/layerSources.js

@@ -0,0 +1,45 @@
+import {
+  createOpenSkySource,
+  createAdsbLolSource,
+  createAisStreamSource,
+} from '../sources/live/standalone.js';
+import { createCctvSource } from '../layers/cctv/source.js';
+import { createRadioSource } from '../layers/radio/source.js';
+import { createTrafficSource } from '../layers/traffic/source.js';
+import { createBikeshareSource } from '../layers/bikeshare/source.js';
+import { createInstallationSource } from '../layers/installations/index.js';
+import { createSatelliteSource } from '../layers/satellites/index.js';
+import { createLaunchSource } from '../layers/launches/index.js';
+import { createOverpassAlprSource } from '../layers/alpr/index.js';
+import { createFirmsSource } from '../layers/firms/index.js';
+import { createUsgsEarthquakeSource } from '../layers/earthquakes/source.js';
+import { createBundledCableSource } from '../layers/submarineCables/bundledSource.js';
+
+/** Existing reference feeds, usable independently of live source selection. */
+export function createStandaloneReferenceSources() {
+  return {
+    earthquakes: createUsgsEarthquakeSource(),
+    cables: createBundledCableSource(),
+  };
+}
+
+/** Select standalone providers without starting their acquisition. */
+export function createStandaloneLayerSources() {
+  return {
+    ...createStandaloneReferenceSources(),
+    flights: createOpenSkySource(),
+    military: createAdsbLolSource(),
+    vessels: createAisStreamSource({
+      apiUrl: import.meta.env?.VITE_AIS_LIVE_API_URL || '/api/ais-live',
+    }),
+    cctv: createCctvSource(),
+    radio: createRadioSource(),
+    traffic: createTrafficSource(),
+    bikeshare: createBikeshareSource(),
+    installations: createInstallationSource(),
+    satellites: createSatelliteSource(),
+    launches: createLaunchSource(),
+    alpr: createOverpassAlprSource(),
+    firms: createFirmsSource(),
+  };
+}