Add workflow_dispatch input support for manual tag releases

[Copilot]

The release workflow now supports manual triggering with a custom tag input, allowing users to create releases without needing to push a git tag first.

What Changed

Added inputs.tag parameter to the workflow_dispatch trigger in .github/workflows/release.yaml with enhanced version extraction logic that handles both scenarios:

• Tag push releases (existing): Works exactly as before when pushing tags like v2.1.0
• Manual dispatch releases (new): Allows specifying a tag via workflow input

Key Features

• Flexible input: Accepts tags with or without 'v' prefix (e.g., 'v2.1.0' or '2.1.0')
• Smart validation: Automatically adds 'v' prefix if missing
• Proper versioning: Correctly formats versions for changelog lookup vs GitHub release creation
• No breaking changes: Maintains full backward compatibility

Usage

When manually triggering the workflow, you can now specify the tag to release:

Tag to release: v2.1.0

The workflow will:

1. Extract version 2.1.0 for changelog lookup
2. Use full tag v2.1.0 for GitHub release creation
3. Create the release with proper changelog content

This is especially useful for hotfixes or when you need to create a release from a specific commit without creating a tag first.

Fixes #10.

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