Add ready method to monitoring services

Implemented a ready method for all monitoring services to standardize initialization readiness checks. Updated initialization logic in SentryMonitoringService to determine environment and invoke appropriate client initialization.

packages/monitoring/baselime/src/hooks/use-baselime.ts

@@ -22,6 +22,9 @@ export function useBaselime(): MonitoringService {
       captureEvent<Extra extends object>(event: string, extra?: Extra) {
         return sendEvent(event, extra);
       },
+      ready() {
+        return Promise.resolve();
+      }
     } satisfies MonitoringService;
   }, [captureException, sendEvent, setUser]);
 }