SAN FRANCISCO, United States — Airbnb, facing tighter local regulations on short-term home rentals, announced Wednesday it is adding boutique hotels, car rentals and grocery delivery to its app in a bid to transform itself into a one-stop travel shop.The rollout marks the latest step in Airbnb’s push to capture more of the travel spending that currently flows to competitors like Booking.com and Expedia.This evolution — 18 years after the company’s scrappy beginnings in San Francisco — is one of Airbnb’s answers to increasingly tough restrictions on short-term rentals in key markets.In December…
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