feat: Refactor outlets with multilingual support and dynamic queries
- Replace static articles array with dynamic source_keyword queries
- Use MongoDB _id as unique identifier for outlets
- Add multilingual translations (9 languages: ko, en, zh_cn, zh_tw, ja, fr, de, es, it)
- Add OutletService for database operations
- Add outlet migration script with Korean source_keyword matching
- Remove JSON file-based outlet loading
- Add /outlets/{outlet_id}/articles endpoint for dynamic article retrieval
This resolves the design issues with:
1. Static articles array requiring constant updates
2. Lack of multilingual support for outlet names/descriptions
3. Broken image URLs
4. Korean entity matching for article queries
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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