meteor3: REST API async migration COMPLETE — smoke green on Meteor 3.1 + Mongo 7

All 12 Flutter REST endpoints byte-identical to the 1.6.1.1 baseline, running on
Meteor 3.1 against dockerized MongoDB 7. The 3.x jump works end-to-end.

- Rest.js: every endpoint action -> async; all Mongo calls -> *Async
  (findOneAsync/countAsync/fetchAsync/upsertAsync/removeAsync).
- Helpers to async: countRealFires (accepts array|cursor, forEachAsync->for-of),
  firesUnion (fetchAsync), fireFromHash/findOrCreateFire (await, dropped Fibers
  Promise.await), subscriptionsInsert/subscriptionsRemove, upsertFalsePositive,
  falsePositives.insert, subscriptions.update method, countFiresInRegions.
- getFires: countAsync() on a $near cursor throws on the mongodb 6 driver
  ($near not allowed in the aggregation countDocuments uses) -> fetch once and
  use array length for total.
- Route order: json-routes 3.0 matches in registration order, so
  mobile/subscriptions/all/:token/:mobileToken is now registered BEFORE
  :token/:mobileToken/:subsId (else GET .../all/x/y hit the delete-only route).

imports/api/FalsePositives/server/publications.js

@@ -17,8 +17,8 @@ Meteor.publish('falsePositivesTotal', function total() {
   return counter;
 });
 
-export const firesUnion = (fires) => {
-  const firesArray = Array.isArray(fires) ? fires : fires.fetch(); // if not is a cursor
+export const firesUnion = async (fires) => {
+  const firesArray = Array.isArray(fires) ? fires : await fires.fetchAsync(); // if not is a cursor
   const remap = firesArray.map(function remap(doc) {
     const isNASA = doc.type === 'modis' || doc.type === 'viirs';
     const pixelSize = doc.type === 'viirs' ? 0.375 : 1; // viirs has 375m pixel size, modis 1000m