Update ArticleSummary metadata and bump version to 0.5.0

[LiangWei88]

This PR updates the FreshRSS Article Summary Extension from version 0.2.0 to 0.5.0 with significant enhancements and improvements.

Changes in This PR:

Version 0.2.0

• Added support for Ollama API provider
• Implemented streaming response processing for real-time summary display
• Enhanced error handling with detailed error messages
• Added automatic API version handling
• Improved HTML to Markdown content conversion
• Updated content security policy configuration

Version 0.3.0

• Implemented internationalization (i18n) support
• Added English, Simplified Chinese (zh-CN), and Traditional Chinese (zh-TW) translations
• Updated language code structure to follow international standards
• Enabled dynamic language switching for all interface elements
• Added default prompt and placeholder functionality for language-specific defaults

Version 0.4.0

• Added streaming response support for OpenAI API, consistent with Ollama API

Version 0.5.0

• Code Quality Improvements : Added type declarations, marked classes as final , implemented PHPStan static analysis, and added PHPUnit tests
• Compatibility Fixes : Restored string-based hooks for backward compatibility with older FreshRSS versions
• Essential Fix : Restored ob_start() in summarizeAction() to prevent "headers already sent" errors in JSON API responses
• Updated .gitignore and improved code documentation
  This update significantly enhances the extension's functionality, flexibility, and maintainability while ensuring compatibility with both modern and older FreshRSS versions.