- Remove has_ai_extract/has_foursquare conditionals from all templates
- Remove boolean fields from template structs and route handlers
- Remove has_ai_extract()/has_foursquare() methods from AppState
- Change API key fields from Option<String> to String in ServerConfig
and AppState
- Validate keys in run_server() with clear error messages
- Remove runtime key checks from extraction/nearby route handlers
- Update README and CLAUDE.md to reflect required configuration