Extract DiRegistrationMap for explicit container registrations (#233)

[Skymly]

Summary

• Introduce DiRegistrationMap / DiRegistrationMapBuilder that records type→lifetime from explicit MSDI (Add* / TryAdd) and Autofac (RegisterType / Register) registrations.
• Wire CaptiveDependencyAnalyzer DP062 constructor analysis for those entries to read the map; keep attributed RegisterDi and DP066 factory-delegate collection private (out of scope for Registration map: explicit container registrations #233).
• Add unit tests for representative map shapes; existing DP062/DP066 Verify coverage stays green (behaviour freeze).

Related Issue

Closes #233

Solution module

• Analyzers (DesignPatterns.Analyzers/ + DesignPatterns.CodeFixes/)

Type of change

• Refactor (no behavior change)

Test plan

• dotnet test tests/DesignPatterns.Analyzers.Tests --filter FullyQualifiedName~DiRegistrationMapTests
• dotnet test tests/DesignPatterns.Analyzers.Tests --filter "FullyQualifiedName~CaptiveDependency|FullyQualifiedName~FactoryDelegateCaptive"
• ./build.ps1 --target Ci --configuration Release
• Sibling samples (if API/generator behavior changed): N/A (internal analyzer refactor)

Breaking changes

• None

Checklist

• This PR touches only one solution module (see AGENTS.md)
• Commit messages are in English (no AI/agent tooling mentions in commits)
• PR description is English only
• No version bumps, tags, releases, or NuGet publish steps included unless explicitly requested
• Public API / diagnostic / generated code changes are documented if user-visible

Documentation checklist

• No documentation changes needed