Add comprehensive inventory of all .csproj files in the repository

[Copilot]

This PR adds a complete catalog of all C# project files (.csproj) found throughout the Telerik Blazor UI repository to improve project navigation and documentation.

What's Added

Two new files have been created in the repository root:

1. csproj-files-list.md - A well-organized markdown document that categorizes all 121 .csproj files by component type and functionality, making it easy to navigate the repository structure
2. csproj-files.txt - A simple text file containing the complete list of file paths for programmatic access and automation scripts

Repository Overview

The inventory reveals the comprehensive scope of the Telerik Blazor UI repository:

• 121 total .csproj files across the entire repository
• Projects span multiple categories including Grid components, Charts, Forms, Navigation, Layout components, Sample applications, and Common utilities
• Architecture includes client/server/shared project patterns for Blazor WebAssembly applications
• Coverage includes legacy project templates, hybrid applications (MAUI, WPF, WinForms), and modern integrations (gRPC, SignalR, AI)

Use Cases

This inventory will be valuable for:

• New contributors understanding the repository structure
• Developers looking for specific component examples
• Build automation and CI/CD pipeline configuration
• Documentation and project management
• Identifying project dependencies and relationships

The categorized markdown format makes it easy to browse by component type, while the text file enables programmatic access for scripts and tools.

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[EdCharbeneau]

Update the list to indicate what version of .NET the .csproj file targets. @copilot