Normalize line endings in embedded shell scripts before deploying (#586)

Windows MSI builds embed .sh files with CRLF line endings, which would
break when deployed to the gateway. Normalize to LF in ReadEmbeddedResource
so all deploy paths get Unix line endings automatically.

Author: tvancott42

src/NetworkOptimizer.Web/Services/PerfTweaksDeploymentService.cs

@@ -676,7 +676,7 @@ public async Task SetManuallyDeployedAsync(string tweakId, bool isManual)
         if (stream == null) return null;
 
         using var reader = new StreamReader(stream);
-        return reader.ReadToEnd();
+        return reader.ReadToEnd().Replace("\r\n", "\n");
     }
 
     private static byte[]? ReadEmbeddedResourceBytes(string fileName)