Improve code structure

- Add separate API project
- Add notification system

HyperbolicDownloaderApi/FileProcessing/PublicHyperFileInfo.cs

@@ -0,0 +1,24 @@
+using HyperbolicDownloaderApi.Networking;
+
+namespace HyperbolicDownloaderApi.FileProcessing;
+
+public class PublicHyperFileInfo
+{
+    public string Hash { get; set; } = string.Empty;
+    public List<NetworkSocket> Hosts { get; set; } = new();
+
+    public PublicHyperFileInfo()
+    {
+    }
+
+    public PublicHyperFileInfo(string hash)
+    {
+        Hash = hash;
+    }
+
+    public PublicHyperFileInfo(string hash, List<NetworkSocket> hosts)
+    {
+        Hash = hash;
+        Hosts = hosts;
+    }
+}