list_verticals

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List all available business verticals (categories) with the count of businesses in each. USE WHEN: - User asks "what types of businesses do you have?" - User is exploring: "what can I find on Plexa?" - You need to know which verticals are available before searching - User uses a category you're not sure maps to a vertical DO NOT USE WHEN: - You already know the vertical (go straight to search_businesses) - User named a specific service (search_businesses with that vertical) RETURNS: List of verticals with key (for search) and count of active businesses in each. CURRENT VERTICALS: dental, medical, veterinary, restaurant, realestate, professional, insurance, tourism, wellness, events, automotive, hospitality, other BEST PRACTICES: - Use the vertical key (not display name) in search_businesses - "dentist" -> dental, "hotel" -> hospitality, "spa" -> wellness - Call this once at the start if you'll do multiple searches EXAMPLES: - list_verticals() -> [{key: "dental", count: 430}, {key: "restaurant", count: 801}, ...]