ライセンス取得関連対応

[finphie]

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[Copilot]

Pull Request Overview

This PR adds license-related functionality to the GitHub client library and performs some refactoring of documentation comments in partial classes.

• Adds new ILicensesClient interface and implementation for retrieving repository license content
• Refactors HTTP client configuration by extracting common functionality into separate methods
• Updates XML documentation comments from <summary> to <content> tags for partial classes

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
GitHubClientExtensions.cs	Extracts common HTTP client configuration logic into separate methods
GitHubClient.cs	Adds Licenses property and parameterless Create() method
GitHubClient.Licenses.cs	Implements new license content retrieval functionality
ILicensesClient.cs	Defines interface for license-related operations
IGitHubClient.cs	Adds Licenses property to main interface
Multiple partial class files	Updates documentation tags from <summary> to <content>
Solution files	Migrates from .sln to .slnx format

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