Fix: Improve matching accuracy, add scoring algorithm, threshold slider, and Chinese localization

[ERROR0cai]

What's changed in this PR

• Fix: Resolved incorrect matches caused by name containment (e.g., "Minesweeper" being mis-matched to "14 Minesweeper Variants")
• Add: Similarity scoring algorithm with multi-dimensional scoring (exact match, containment match, word match, prefix match)
• Add: Adjustable match threshold slider in settings (default: 50%) for users to control matching strictness
• Add: Full Chinese (zh-CN) localization support
• Improve: Notifications now display match scores for each game

Testing

• Tested locally in Playnite environment
• Fix works as expected for the reported name-containment issue

Related Issues

Fixes #4