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Upgrades pypetkitapi to 1.28.0, which adds the Eversweet Ultra (W7H fountain with AI camera). The poller now extracts per-pet drinking events (drink_over/pet_detect records) into a new drinking_events table, plus Ultra-specific alerts for waste tank full and filter expiry. Uncertain state fields (cwt/wt/pump) are logged for threshold tuning against real data. Exposes the data via a new /api/pets/drinking-events endpoint, a Fountain Activity dashboard section, and a simbakit_drinking_activity LangChain tool so the agent can answer hydration questions. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>