Update health-check logic with adaptive thresholds

Replaced the fixed 3x interval multiplier with an adaptive threshold
based on the configured interval duration. Health states (`Healthy`,
`Degraded`, `Unhealthy`) were redefined to reflect this change.

- Adaptive multiplier: 3x for fast intervals (<10s), 1.5x for slower
  intervals (≥10s), ensuring faster problem detection for longer
  intervals and tolerance for jitter in shorter intervals.
- Updated `CheckHealthAsync` to calculate `maxAllowedDelay` using the
  adaptive multiplier.
- Added `Multiplier` and `MaxAllowedDelay` to diagnostic data for
  better monitoring and debugging.
- Improved documentation and comments to explain the new logic.

ECMJobRunner.WebCron/ProfileWorker/ProfileWorker.cs

@@ -18,12 +18,14 @@ namespace ECMJobRunner.WebCron.ProfileWorker;
 /// <item><description>Tracks health status based on success/failure patterns</description></item>
 /// <item><description>Gracefully handles cancellation during application shutdown</description></item>
 /// </list>
-/// Health states:
+/// Health states (with adaptive thresholds):
 /// <list type="bullet">
-/// <item><description><b>Healthy</b>: Last successful run within 3x interval</description></item>
-/// <item><description><b>Degraded</b>: 1-2 consecutive failures but within time limit</description></item>
-/// <item><description><b>Unhealthy</b>: No success for 3x interval or 3+ consecutive failures</description></item>
+/// <item><description><b>Healthy</b>: Recent successful run with no failures</description></item>
+/// <item><description><b>Degraded</b>: 1+ consecutive failures but within time threshold</description></item>
+/// <item><description><b>Unhealthy</b>: No success within adaptive threshold (3x interval for fast intervals &lt;10s, 1.5x for slower intervals)</description></item>
 /// </list>
+/// The adaptive multiplier ensures fast problem detection when using longer intervals (e.g., 60s interval = 90s timeout)
+/// while maintaining tolerance for network jitter on short intervals (e.g., 1s interval = 3s timeout).
 /// </remarks>
 public class ProfileWorker(
     ILogger<ProfileWorker> Logger, 
@@ -112,20 +114,24 @@ public class ProfileWorker(
     /// <remarks>
     /// Health determination logic:
     /// <list type="number">
-    /// <item><description><b>Unhealthy</b>: Time since last success exceeds 3x the configured interval</description></item>
+    /// <item><description><b>Unhealthy</b>: Time since last success exceeds adaptive threshold (3x interval for fast intervals &lt;10s, 1.5x for slower intervals)</description></item>
     /// <item><description><b>Degraded</b>: 1+ consecutive failures within time threshold</description></item>
     /// <item><description><b>Healthy</b>: Recent successful run with no failures</description></item>
     /// </list>
-    /// Includes diagnostic data in the result for monitoring and alerting.
+    /// Adaptive multiplier ensures fast problem detection for longer intervals while maintaining tolerance for short intervals.
     /// </remarks>
     public Task<HealthCheckResult> CheckHealthAsync(
         HealthCheckContext context, 
         CancellationToken cancellationToken = default)
     {
         var timeSinceLastSuccess = DateTime.UtcNow - _lastSuccessfulRun;
-        var maxAllowedDelay = TimeSpan.FromMilliseconds(_options.IntervalMS * 3);
+        
+        // Adaptive multiplier: 3x for fast intervals (<10s), 1.5x for slower intervals
+        // This ensures faster problem detection when using longer intervals (e.g., 60s)
+        var multiplier = _options.IntervalMS < 10000 ? 3.0 : 1.5;
+        var maxAllowedDelay = TimeSpan.FromMilliseconds(_options.IntervalMS * multiplier);
 
-        // Unhealthy: No successful run for 3x interval
+        // Unhealthy: No successful run within adaptive threshold
         if (timeSinceLastSuccess > maxAllowedDelay)
         {
             var data = new Dictionary<string, object>
@@ -133,7 +139,9 @@ public class ProfileWorker(
                 ["LastSuccessfulRun"] = _lastSuccessfulRun,
                 ["TimeSinceLastSuccess"] = timeSinceLastSuccess,
                 ["ConsecutiveFailures"] = _consecutiveFailures,
-                ["IntervalMS"] = _options.IntervalMS
+                ["IntervalMS"] = _options.IntervalMS,
+                ["Multiplier"] = multiplier,
+                ["MaxAllowedDelay"] = maxAllowedDelay
             };
 
             if (_lastException != null)