Load the God's Eye View panel through the MCP server

Hosts serve panels from their own sites and may refuse other addresses;
Codex refuses any address on the user's machine. The panel now never
requests the app's server: it loads the app's panel build and data
through panel_request, a tool only the panel may call, which requests
the path from the app's server. One path in every host; only map
providers load directly.

npm run build:panel writes the panel build to dist/panel, served at
/panel/: one app script, one stylesheet, Cesium's script, and Cesium's
workers as one script Cesium runs from memory. Tools may now be marked
app-only. The panel CORS rules are gone.

src/tools/index.js

@@ -40,6 +40,7 @@ import {
   getTransitVehicles,
 } from './queries/mobility.js';
 import { placesNearby, planRoute, searchPlaces } from './queries/places.js';
+import { panelRequest } from './queries/panelRequest.js';
 import { showInGodsEyeView } from './queries/share.js';
 import { findAlprCameras } from './queries/surveillance.js';
 import {
@@ -122,4 +123,5 @@ export const coreTools = Object.freeze([
   militaryAwareness,
   getHudCaption,
   showInGodsEyeView,
+  panelRequest,
 ]);