WIP(meteor3): server BOOTS on 3.1 + Mongo 7; restivus async-patched

Major milestone: the Meteor 3.1 server boots and runs against dockerized
MongoDB 7, and the REST framework responds (status/uptime OK).

- collection2 v4: import its eager entry 'meteor/aldeed:collection2/static.js'
  from new eager files server|client/00-collection2-init.js so main.js runs and
  patches attachSchema before collections load (v4 is fully lazy, no main module).
- fixtures.js disabled: @cleverbeagle/seeder uses sync Mongo, no Meteor 3 support
  (dev fixtures, not needed for smoke). Debt.
- sitemaps.js disabled: gadicohen:sitemaps@0.0.17 pre-0.9 API, no 'sitemaps'
  global on Meteor 3. Debt (SEO).
- Vendored restivus patched for async endpoints: route handler is async and
  awaits _callEndpoint; _callEndpoint awaits the action + auth/role checks.

NEXT: Rest.js endpoints + helpers (countRealFires/firesUnion/whichAreFalsePositives/
fireFromHash/subscriptionsInsert/upsertFalsePositive) still use sync Mongo
(.count()/.findOne()/.fetch()/.insert()/.upsert()) -> convert to *Async, then
smoke test against Mongo 7.

imports/startup/server/index.js

@@ -3,13 +3,19 @@ import './catchExceptions';
 import './i18n';
 import './accounts';
 import './api';
-import './fixtures';
+// Meteor 3 debt: '@cleverbeagle/seeder' (dev/staging fixtures) uses sync Mongo
+// (findOne) and has no Meteor 3 async support. Disabled — not needed for the
+// REST smoke test. Re-implement dev fixtures with *Async if desired.
+// import './fixtures';
 import './email';
 import '/imports/api/Comments/server';
 import './IPGeocoder';
 import './migrations';
 import './facts';
-import './sitemaps';
+// Meteor 3 debt: gadicohen:sitemaps@0.0.17 uses the pre-0.9 package API and no
+// longer exports the `sitemaps` global on Meteor 3. Disabled (SEO sitemap, not
+// on the REST path). Replace with a maintained sitemap approach if needed.
+// import './sitemaps';
 import './subsUnion';
 import './prerender';
 import './feedback';