Add deps command for dependency tree visualization

[Copilot]

This PR implements a new deps command that creates a tree-like output structure showing project and NuGet package dependencies in a solution or specific project.

Features

Tree Visualization: The command displays dependencies in a hierarchical tree format with Unicode characters:

📦 ConsoleApp (net8.0)
  ├── LibraryA (net8.0)
    ├── 📎 Newtonsoft.Json v13.0.3
  ├── LibraryB (net8.0)
    ├── LibraryA (net8.0)
      ├── 📎 Newtonsoft.Json v13.0.3
    ├── 📎 Serilog v3.1.1
  ├── 📎 Microsoft.Extensions.Hosting v8.0.0

Flexible Analysis:

• Analyze entire solutions: bld deps (finds all .sln files in current directory)
• Analyze specific projects: bld deps --project MyProject.csproj
• Recursive from root or specific project as specified in requirements

NuGet Package Control: The --nuget option allows including or excluding NuGet package references:

• bld deps --nuget=true (default) - shows both project and package dependencies
• bld deps --nuget=false - shows only project references

Advanced Package Support:

• Handles central package management (Directory.Packages.props)
• Shows package versions correctly even when centrally managed
• Indicates private assets with [Private] annotation
• Gracefully handles missing or unknown versions

Circular Reference Detection: Prevents infinite recursion by detecting and marking circular project references with [CIRCULAR REFERENCE].

Reusable Architecture

The implementation provides reusable components as requested:

• DependencyAnalyzer service for building dependency trees
• DependencyInfo, ProjectReference, PackageReference models for structured dependency data
• DependencyNode for tree representation

This infrastructure can be easily extended for future nuget package version compatibility checking as mentioned in the requirements.

Usage Examples

# Show all dependencies for projects in current solution
bld deps

# Analyze specific project with packages
bld deps --project ./MyApp/MyApp.csproj

# Show only project references (no NuGet packages)
bld deps --project ./MyApp/MyApp.csproj --nuget=false

# Analyze with custom root directory
bld deps --root ./src

The command integrates seamlessly with the existing CLI structure and follows the same patterns as other commands in the codebase.

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