v2.0.0

Release v2.0.0

🚀 New Features

• Smart Backend Scoring: Uses composite scoring (Success Rate, Latency, and Result Quality) for the best-latency strategy.
• Search Result Caching: LRU cache with TTL to reduce API quota usage.
• Enhanced DuckDuckGo: Leverages ddgs v9.x metasearch features (backend selection, region, and timelimit).
• Per-Backend Configuration: Custom timeout, maxResults, and headers per search provider.
• Combine Mode Config: Option to force multi-backend RRF mode directly from search.json.

🛠 Refactoring & Improvements

• Modular Architecture: Major refactor from a single-file monolith to a modular structure for improved maintainability.
• Improved Marginalia: Updated to the new api2.marginalia-search.com endpoint.
• Robustness: Enhanced error sanitization and credential resolution (env/shell/literal).

🧪 Testing

• Added comprehensive integration tests covering dispatch, config, credentials, and caching.