Add .NET/NuGet cache support #4
Description
.NET developers accumulate NuGet package caches that can grow significantly.\n\nCache Details:\n- Location: ~/.nuget/packages/\n- Typical size: 5-15 GB\n- Safe to delete: Yes (packages are restored on next build)\n\nImplementation:\n- Add NuGet cache entry to the scanner\n- Display as '.NET NuGet' in the cache list\n\nGood first issue for .NET developers.