feat: add devtools extract and decompile CLI commands

[Arthurvdv]

Summary

Adds two new CLI subcommands under alcops devtools:

alcops devtools extract

Download and extract BC DevTools from NuGet packages or VS Marketplace VSIX archives.

# NuGet DevTools (requires --tfm)
alcops devtools extract --source nuget --version latest --tfm net8.0 --output ./DevTools

# VS Marketplace VSIX (legacy/netstandard)
alcops devtools extract --source vsix --version prerelease --output ./DevTools

# With file filtering
alcops devtools extract --source nuget --tfm net8.0 --output ./DevTools --include '*.dll'

alcops devtools decompile

Decompile .NET assemblies using ILSpy CLI for source analysis.

alcops devtools decompile --input ./DevTools/net8.0 --output ./DevTools/decompiled

# Custom assembly list
alcops devtools decompile --input ./DevTools/net8.0 --output ./decompiled \
  --assemblies Microsoft.Dynamics.Nav.CodeAnalysis,Microsoft.Dynamics.Nav.CodeCop

Changes

• src/devtools/package-extractor.ts - Shared ZIP extraction utility with path prefix filtering and optional glob include
• src/devtools/extract-command.ts - NuGet + VSIX download and extraction orchestration
• src/devtools/decompile-command.ts - ILSpy CLI orchestration (dotnet tool install + ilspycmd)
• src/cli.ts - Wired devtools command group with extract/decompile subcommands
• 20 new tests covering extraction, glob matching, command validation

Technical notes

• Reuses existing primitives (fflate, httpsGetBuffer, version resolvers) - no new dependencies
• In-memory ZIP extraction via fflate (v1; streaming optimization possible later)
• JSON output to stdout, logs to stderr (matches existing CLI conventions)
• Requires .NET SDK for decompile command only