Unified search across all verticals

Provides a single entry point to search across all verticals (Restaurants, Hotels, Experiences) with unified filtering, ranking, and pagination. This endpoint acts as a wrapper over the respective search endpoints for each vertical. **Supported Data Types:** - RESTAURANT: Search for restaurants with filters like cuisines, tags, location - EXPERIENCE: Search for experiences with filters like categories, location - HOTEL: Search for hotels with filters like amenities, check-in/out dates, location **Authentication:** Optional. If provided, enables personalized results.