feat: forward chainsyncrequest action for multi-chain batch sync

Whitelists the new action type for socket delivery to SSP Key. Pass-through
only; rate limiting and the FCM notification path apply unchanged.

Author: TheTrunk

src/apiServices/actionApi.ts

@@ -276,7 +276,8 @@ async function postAction(req, res) {
       data.action === 'enterprisevaultsign' ||
       data.action === 'enterprisekeynoncesync' ||
       data.action === 'enterprisefluxnodestart' ||
-      data.action === 'recoveryrequest'
+      data.action === 'recoveryrequest' ||
+      data.action === 'chainsyncrequest'
     ) {
       const ioKey = socket.getIOKey();
       ioKey.to(data.wkIdentity).emit(data.action, data);

src/lib/socket.ts

@@ -159,7 +159,8 @@ function initIOKey(httpServer?, path = '/v1/socket/key') {
           actionToSend.action === 'enterprisevaultxpub' ||
           actionToSend.action === 'enterprisevaultsign' ||
           actionToSend.action === 'enterprisefluxnodestart' ||
-          actionToSend.action === 'recoveryrequest'
+          actionToSend.action === 'recoveryrequest' ||
+          actionToSend.action === 'chainsyncrequest'
         ) {
           ioKey.to(wkIdentity).emit(actionToSend.action, actionToSend);
         }