config: Add ProfileWorker configuration section

- ProfileWorker:IntervalMS = 1000 (1 second sync interval)
- Configurable via appsettings.json with IOptions pattern
- Validated at startup via ProfileWorkerOptionsValidator

ECMJobRunner.WebCron/appsettings.json

@@ -20,5 +20,8 @@
   },
   "Application": {
     "LogDirectory": "E:\\LogFiles\\Digital Data\\ECMJobRunner.WebCron"
+  },
+  "ProfileWorker": {
+    "IntervalMS": 1000
   }
 }