Bump version to 0.3.1 and update repository links

[RorroRojas3]

This pull request is a metadata-only patch release (v0.3.1) for the four lockstep packages: Andes.Extensions.AI, Andes.Extensions.AI.Mcp, Andes.Extensions.AI.Agent, and Andes.Extensions.AI.UI. There are no code or behavioral changes. The updates focus on correcting repository links, updating documentation references, and ensuring the README files link to the correct NuGet packages.

Versioning and repository metadata:

• All four packages are bumped to version 0.3.1 to maintain lockstep versioning. [1] [2] [3] [4]
• <RepositoryUrl> in all .csproj files is updated to point to the current repository (https://github.com/Andes-Software-Solutions/Andes.Extensions.AI). [1] [2] [3] [4]

Documentation and README improvements:

• The root README.md now includes direct links to each satellite package's NuGet page in the MCP, Agent, and UI sections. [1] [2] [3]
• The "repository docs" links in the satellite package READMEs are updated to the new repository location. [1] [2] [3]

Release notes:

• Added a releases/v0.3.1.md file summarizing these metadata and documentation changes, clarifying that there are no code or API updates in this release.…tadata and READMEs

[Copilot]

Pull request overview

This PR prepares a metadata-only patch release (v0.3.1) for the four lockstep Andes.Extensions.AI packages by updating package versions and correcting repository/documentation links, without changing any source code behavior.

Changes:

• Bumped package versions to 0.3.1 across Andes.Extensions.AI, Andes.Extensions.AI.Mcp, Andes.Extensions.AI.Agent, and Andes.Extensions.AI.UI.
• Updated all package <RepositoryUrl> values to the current GitHub repository.
• Improved README and release notes links (NuGet links in the root README; updated docs links in satellite package READMEs; added releases/v0.3.1.md).

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
releases/v0.3.1.md	Adds 0.3.1 release notes describing the metadata-only release and link corrections.
README.md	Adds direct NuGet links for the satellite packages in MCP/Agent/UI sections.
Andes.Extensions.AI/Andes.Extensions.AI.csproj	Bumps version to 0.3.1 and updates <RepositoryUrl> to the current repo.
Andes.Extensions.AI.Mcp/Andes.Extensions.AI.Mcp.csproj	Bumps version to 0.3.1 and updates <RepositoryUrl>.
Andes.Extensions.AI.Mcp/README.md	Updates “repository docs” link to the current repo’s docs.
Andes.Extensions.AI.Agent/Andes.Extensions.AI.Agent.csproj	Bumps version to 0.3.1 and updates <RepositoryUrl>.
Andes.Extensions.AI.Agent/README.md	Updates “repository docs” link to the current repo’s docs.
Andes.Extensions.AI.UI/Andes.Extensions.AI.UI.csproj	Bumps version to 0.3.1 and updates <RepositoryUrl>.
Andes.Extensions.AI.UI/README.md	Updates “repository docs” link to the current repo’s docs.

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