Implement automatic versioning and GitHub releases system

[Copilot]

This PR implements a comprehensive automatic versioning and release system for IdleOutpostClaimer that addresses all requirements from the issue:

🎯 Features Implemented

Automatic Versioning

• Auto-increment version numbers: Each push/merge to main automatically increments the patch version (1.0.4 → 1.0.5 → 1.0.6)
• Version visibility in logs: The application now displays its current version in all log output:

  [22.07.25-20:37] 🚀 Idle Outpost Claimer v1.0.4 gestartet.
  [22.07.25-20:37] ⚙️ Idle Outpost Claimer v1.0.4 - Führe planmäßigen Claim aus...
  

GitHub Releases

• Automatic release creation: New GitHub releases are created automatically on every push/merge to main
• Commit history inclusion: Release notes include all commit messages since the last release
• Git tagging: Proper semantic version tags (v1.0.5, v1.0.6, etc.)

Docker Integration

• Versioned Docker images: Images are automatically tagged with both latest and version-specific tags
• Seamless CI/CD: Replaces the existing docker-publish workflow with enhanced functionality

🔧 Technical Implementation

Core Components

• version.py: New version management module with get_version() and get_version_info() functions
• Updated app.py: Integrated version display without changing core functionality
• .github/workflows/version-and-release.yml: Comprehensive GitHub Actions workflow

Workflow Features

• Triggers on pushes to main branch or merged pull requests
• Reads current version from Python code
• Increments patch version automatically
• Updates version file and commits changes
• Creates git tags and GitHub releases
• Builds and publishes Docker images with version tags
• Generates changelogs from commit history

🧪 Testing

All functionality has been validated:

• ✅ Version module works correctly
• ✅ App displays version in logs
• ✅ Version increment logic tested
• ✅ Core application functionality preserved
• ✅ Python imports work with version integration

📚 Documentation

• Updated README.md with versioning information
• Added release version badge
• Comprehensive versioning section with usage examples
• Commands for checking current version

The system is production-ready and will automatically handle versioning and releases starting with the next merge to main.

Fixes #6.

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