chore: remove unreachable legacy entry modules

Delete three modules that no entry point, package export, test or script
imports:

- src/ui.js, a StyleManager subclass that pre-selected the standalone
  catalog. Application controls are built through src/app/controls.js
  and src/standalone/controls.js.
- src/standalone/ui.js, a bare re-export of StyleManager.
- src/data/localLayers.js, a list of default infrastructure, cable and
  FIRMS layer instances. The catalog builds these layers itself.

With src/ui.js gone, the import-direction check keeps a single
compatibility exception (server/providers/local.js to
server/standalone/key-setup.js), and its test now asserts that a
src/ui.js importing standalone code is rejected. The boundary and
format registries and the docs that named these files are updated.

scripts/format-scope.json

@@ -285,8 +285,6 @@
   "src/ui/sceneControls.test.mjs",
   "scripts/qa-scene-controls.mjs",
   "scripts/qa-action-buttons.mjs",
-  "src/ui.js",
-  "src/standalone/ui.js",
   "src/ui/applicationShell.js",
   "src/ui/panelLayoutController.js",
   "src/ui/panelPositionControls.js",