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If your temperatures fall below freezing, it will likely not winter over outdoors.

https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm

Lantana berries develop from the spent blooms. he plants can successfully be grown in many types of containers, so transplanting from the hanging basket to a planter, is fine. Regardless, they will still require more watering than those left in the ground, usually on a daily basis as you are already doing. You can keep it in your garage or a heated greenhouse (just above freezing). The house is usually warmer than 50 degrees at night, but if you have a location that is bright and sunny, but doesn't freeze (50 degrees at night) 70-80 degrees during the day, it could possibly make it through the winter. Or you can let the blooms go to seed and collect

This article should help with that: https://www.gardeningknowhow.com/plant-problems/pests/organic-snail-control-how-to-control-garden-snails.htm

Lantana is grafted onto a root stock to form a Lantana standard.

Many garden centers carry these for sale each spring and summer.

https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm

Yes, deadhead them frequently to optimize blooming.

Also cutting them back can rejuvenate the plants.

Here is a link with more information.

https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm

The leaves of lantana can be used in herbal teas. As for other flowers/herbs that are used for teas, they include chamomile, lemon verbena, pennywort, mint, rosemary, jasmine, violets and lavender.