Enhance configuration and routing for streaming features: update .env.example and appsettings.json to include new scheduler and streaming options, add streaming endpoint mapping in Program.cs, and integrate streaming services in DependencyInjection. Introduce segment path resolution in MediaPathResolver for asset management.

backend/src/TeleWave.Infrastructure/Media/MediaPathResolver.cs

@@ -40,6 +40,13 @@ public sealed class MediaPathResolver
 
     public string AssetRelativePath(Guid assetId) => $"assets/{assetId:N}";
 
+    /// <summary>Путь к файлу сегмента внутри каталога ассета (имя файла проверяется на traversal).</summary>
+    public string SegmentPath(Guid assetId, string fileName)
+    {
+        var assetDir = AssetDir(assetId);
+        return EnsureWithin(assetDir, Path.Combine(assetDir, fileName));
+    }
+
     /// <summary>Резолвит имя файла внутри uploads/ (токен загрузки), проверяя выход за пределы каталога.</summary>
     public string UploadPath(string token) =>
         EnsureWithin(UploadsDir, Path.Combine(UploadsDir, token));