Refactor the `ProfileWorker` class to enhance health-check handling, including support for an uninitialized state. The `_lastSuccessfulRun` field was changed to a nullable `DateTime?` to represent when the service has not yet completed its first successful run.
Introduce a new health state, **Degraded (Initializing)**, to indicate the service is starting up. Update the `CheckHealthAsync` method to handle this state and return a `HealthCheckResult.Degraded` with relevant metadata.
Refine health-check logic to safely access `_lastSuccessfulRun.Value` only when initialized. Update documentation to clarify health status conditions and retain adaptive multiplier logic for detecting issues based on interval length.
Enhance `HealthCheckResult` metadata with additional details, including `LastSuccessfulRun`, time since last success, and consecutive failures. Improve comments and descriptions for better clarity.
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