feat: Add standardized release workflow for v* tags and beta/alpha pre-releases

[Copilot]

🎯 Overview

This PR implements a standardized release workflow that automatically creates GitHub releases based on tag patterns, addressing the need for proper release management in the repository.

✨ Features

🚀 New Release Workflow (.github/workflows/release.yml)

• Normal Releases: Tags starting with v* (e.g., v1.0.0, v2.1.3) → Published as stable releases
• Pre-releases: Tags containing beta or alpha → Published as pre-releases
• Action: Uses softprops/action-gh-release@v2 for modern GitHub release creation
• Assets: Automatically includes UserScript files and VERSION file as release assets
• Changelog: Auto-generates release notes from commit history since last tag

📋 Tag Pattern Examples

# Normal releases (stable)
git tag v1.0.0 && git push origin v1.0.0

# Pre-releases (testing)
git tag v1.0.0-beta.1 && git push origin v1.0.0-beta.1
git tag beta-v0.1.0 && git push origin beta-v0.1.0
git tag alpha-v0.2.0 && git push origin alpha-v0.2.0

📚 Updated Documentation

Added comprehensive development workflow section to README.md:

• Development Flow: dev branch → Pull Request → main branch → tag → release
• Tag Standards: Clear guidelines for release vs pre-release tagging
• Integration: Works seamlessly with existing automatic versioning system

🔧 Workflow Logic

# Detects release type based on tag pattern
if [[ "$TAG_NAME" == *"beta"* ]] || [[ "$TAG_NAME" == *"alpha"* ]]; then
  # Pre-release
elif [[ "$TAG_NAME" == v* ]]; then
  # Normal release
else
  # Default to pre-release for safety
fi

🛡️ Safety & Maintenance

• Comprehensive Comments: Detailed maintenance instructions throughout the workflow
• Backward Compatible: Existing bump-version.yml workflow remains unchanged
• Safe Defaults: Unknown tag patterns default to pre-release
• Validation: YAML syntax and logic thoroughly tested

📖 Usage Instructions

1. Development: Work on dev branch
2. Integration: Merge to main via Pull Request only
3. Release: Create appropriate tag from main branch:
   • v1.0.0 for stable release
   • v1.0.0-beta.1 for pre-release

The workflow will automatically:

• ✅ Detect release type from tag pattern
• ✅ Generate changelog from commits
• ✅ Create GitHub release with proper pre-release flag
• ✅ Attach UserScript files as downloadable assets

🔄 Integration

This PR complements the existing automatic versioning system:

• Existing: bump-version.yml handles automatic beta versioning on commits
• New: release.yml handles manual releases via tags
• Result: Complete automation for both development and release workflows

No existing functionality is modified or removed.

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