Wire swaps.xyz swap provider

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Unreleased (develop)
 
+- added: swaps.xyz swap provider wiring (SWAPSXYZ_INIT core plugin init and registration).
 - added: Verbose logging for exchange rate queries: the request body, resolved/rate-less counts, and errors are captured when the Verbose Logging setting is enabled.
 - added: Exchange-rate cache snapshot in the support log output, plus a `rates-cache-replay` script that re-runs those queries against the rates server and reports the result for each pair.
 - added: "-m" tag on the version number in the Help scene for Maestro test builds

src/envConfig.ts

@@ -425,6 +425,11 @@ export const asEnvConfig = asObject({
       quiknodeApiKey: asOptional(asString, '')
     }).withRest
   ),
+  SWAPSXYZ_INIT: asCorePluginInit(
+    asObject({
+      apiKey: asOptional(asString, '')
+    }).withRest
+  ),
   SWAPUZ_INIT: asCorePluginInit(
     asObject({
       apiKey: asOptional(asString, '')

src/util/corePlugins.ts

@@ -99,6 +99,7 @@ export const swapPlugins = {
   letsexchange: ENV.LETSEXCHANGE_INIT,
   nexchange: ENV.NEXCHANGE_INIT,
   sideshift: ENV.SIDESHIFT_INIT,
+  swapsxyz: ENV.SWAPSXYZ_INIT,
   swapuz: ENV.SWAPUZ_INIT,
   xgram: ENV.XGRAM_INIT,
   nymswap: ENV.NYM_SWAP_INIT,