refactor, security updates, cv extraction upgrades

JobTrackerApi/Services/StartupReadiness.cs

@@ -0,0 +1,27 @@
+namespace JobTrackerApi.Services;
+
+public interface IStartupReadiness
+{
+    Task WaitUntilReadyAsync(CancellationToken cancellationToken);
+    void MarkReady();
+}
+
+public sealed class StartupReadiness : IStartupReadiness
+{
+    private readonly TaskCompletionSource<bool> _ready = new(TaskCreationOptions.RunContinuationsAsynchronously);
+
+    public Task WaitUntilReadyAsync(CancellationToken cancellationToken)
+    {
+        if (_ready.Task.IsCompleted)
+        {
+            return Task.CompletedTask;
+        }
+
+        return _ready.Task.WaitAsync(cancellationToken);
+    }
+
+    public void MarkReady()
+    {
+        _ready.TrySetResult(true);
+    }
+}