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That is far to warm for broccoli. They need cooler temps, especially for the soil. Otherwise, the plants will bolt and be inedible. This article will help:
https://www.gardeningknowhow.com/edible/vegetables/broccoli/bolting-broccoli-growing-broccoli-in-hot-weather.htm

They are lacking water and this is making the stems droop. Plants that have been repotted or transplanted need more water than usual until they get settled. They will not bloom again this season, but you can also try using a chopstick (or similar item) to prop the blossoms up while they are in bloom so that you can enjoy them in the garden.

Yes, you can. But make sure to give them agood watering when you do to help prevent stem droop.

Yes, you can. This article will help:
https://www.gardeningknowhow.com/ornamental/bulbs/bgen/how-to-plant-a-flower-bulb-in-your-garden-after-winter-forcing.htm

They are technically perennials but some varieties have a hard time surviving for more than a few years.

It really depends on the type of shrub, but a pruning in spring for non flowering shrubs is normally ok. Most shrubs will not tolerate being cut back by more than 1/3. There are only very specific shrubs that respond to rejuvenation pruning like you are talking about. If you let me know what kind of shrubs they are, I can tell you if you can do rejuvenation pruning on them.