Add PayrollSyncClient release channel with latest.json

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

PayrollSyncClient/latest.json

@@ -0,0 +1,5 @@
+{
+  "version": "1.0.0",
+  "windows": "PayrollSync-Setup-1.0.0.exe",
+  "mac": "PayrollSync-1.0.0.dmg"
+}