meteor3: purge dead client packages — web UI renders on 3.1

alanning:roles removed (client crashed the whole bundle; plain user.roles
checks instead), selaias:cookie-consent replaced by in-repo React banner,
publish-performant-counts vendored with countAsync, Meteor.autorun dropped
(App)/Tracker.autorun (FiresMap), and the map publications not covered by
the REST smoke (activefiresmyloc, activefiresunionmyloc, fireAlerts,
oauth.verifyConfiguration) converted to async APIs.

Verified in browser: / and /fires render with map + cookie banner, zero
uncaught exceptions. REST smoke byte-identical (12/12).

imports/startup/server/facts.js

@@ -1,5 +1,18 @@
-/* global Facts */
-import { Roles } from 'meteor/alanning:roles';
 import { Meteor } from 'meteor/meteor';
+import { Facts } from 'meteor/facts-base';
 
-Facts.setUserIdFilter(userId => Roles.userIsInRole(userId, ['admin']));
+/*
+ * alanning:roles removed (1.x is dead on Meteor 3 — crashes the whole client
+ * bundle at load — and 4.x needs a data migration we don't want). Admin check
+ * against the plain `user.roles` field, cached at startup: facts are
+ * dev/admin instrumentation and the admin set essentially never changes.
+ */
+const adminIds = new Set();
+
+Meteor.startup(async () => {
+  await Meteor.users
+    .find({ roles: 'admin' }, { fields: { _id: 1 } })
+    .forEachAsync(u => adminIds.add(u._id));
+});
+
+Facts.setUserIdFilter(userId => adminIds.has(userId));