feat: add hotel gallery and detail modal

[hoangsvit]

Summary

• preserve up to 12 hotel images already returned by the Google Hotels discovery response, without extra SerpApi calls
• preserve useful detail metadata from discovery: phone, nearby places, typical price range, essential info, eco/sponsored flags
• add a Chi tiết action on each hotel card
• add an in-page detail modal with photo gallery, keyboard navigation, rating/reviews, distance, area, stars, address, phone, check-in/out, amenities, nearby places, price sources and current price
• show an explicit no-photo state when Google Hotels did not include images for a property
• keep the deeper Google Hotels Photos API as an optional later enrichment path instead of calling it for every discovered hotel and consuming quota

API cost

Opening hotel detail/gallery in the browser costs 0 additional SerpApi searches. The gallery uses images captured from the same discovery requests already used by the tracker.

Google Hotels has separate Property Details and Photos APIs keyed by property_token; those can be added later for selected hotels if a richer gallery is needed.

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[github-actions]

🌍 Web preview

• Open travel dashboard
• Open live flight prices
• Open live hotel prices

Preview is pinned to commit 3c51bda and updates automatically when the PR changes.