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If the chicken manure was aged properly (composted) and if you mixed it in with the potting soil, then it won't hurt the tree. Problems could arise if the manure was not aged or if it was added in one layer just below the roots; this could cause the high nitrogen levels to burn the roots. Please see this article:
https://www.gardeningknowhow.com/composting/manures/chicken-manure-fertilizer.htm

I don't think there is anything wrong. Some years it will do this. I don't believe that you have anything to worry about.

This article will refresh you on the care of these: https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-care.htm

With a little trial and error you can, certainly, grow these in container.

This article will get you started: https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maples-in-containers.htm

It is a well established tree. I would not attempt to move it. The roots will be disturbed quite a bit, and this could definitely kill the tree. If you still want to attempt to do this, I would dig out at least 2 feet from the center around to insure that you get enough roots. Do this in spring right before new growth starts. Keep it watered until it recovers. Just know that there is a chance the tree will die if you do this.

A Japanese Maple should grow in your climate. A well draining soil is needed.
Here is a link with more information.
https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-care.htm

You can prune anytime before the new growth returns. Even then it can still be safe to prune for awhile after the new growth shows.