NextPVR Plugin Build Issues Fixed - .NET 8.0 Compatible

[1000mani]

## NextPVR Plugin Build Issues Resolved!

If you've been struggling to build the NextPVR plugin with .NET 8.0 and Jellyfin 10.10.7, I've created a fork that fixes all the common build issues.

### What's Fixed:
- ✅ Updated Jellyfin package versions to 10.8.13
- ✅ Added proper NuGet configuration
- ✅ Created automated build script
- ✅ Full .NET 8.0 compatibility
- ✅ Clear documentation

### Quick Start:
bash
git clone https://github.com/1000mani/jellyfin-plugin-nextpvr.git
cd jellyfin-plugin-nextpvr
build_nextpvr.bat


**Repository:** https://github.com/1000mani/jellyfin-plugin-nextpvr

The build script handles everything automatically - clean, restore, build, and publish. No more dependency issues or complex setup!

I've also submitted a pull request to the original repository to contribute these fixes back to the project.

### What This Solves:
- Build failures due to package version conflicts
- Missing NuGet package source configuration
- .NET 8.0 compatibility problems
- Complex build process for new developers

Hope this helps other developers! 🚀