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OK but too dilute to consider as a source of cinnamon.
Have a cinnamon roll with your coffee.

Depending on the animal It is not recommended unless you really know what you are doing here. It is important not to compost feces from any animal that eats meat. This can breed many bacteria that can be transmitted to humans. This article will give you more information: https://www.gardeningknowhow.com/composting/manures/manure-pros-cons.htm

There are many molds present in compost. That does not appear to be anything dangerous, though. These molds are what are responsible for helping to break down your ingredients into soil, and will not be of much harm. Seeing this much may indicate that you need more brown (dry) ingredients, though.

This article will help: https://www.gardeningknowhow.com/composting/basics/ultimate-beginners-guide-composting.htm

As long as this metal is non-ferrous, isn't copper, and isn't aluminum, then this should be no problem.

This article will help get you started with composting: https://www.gardeningknowhow.com/composting/basics/ultimate-beginners-guide-composting.htm

Start by adding nitrogen-rich “green” organic material. Your brown-to-green ratio should be about 4-to-1. That’s four parts dried leaves to one part grass clippings or vegetable scraps. Next, add moisture to the pile to induce activity. Studies have shown a significant correlation between the moisture content and the temperature distribution within the pile. When moisture content is high, temperatures near the surface will be higher.

https://www.gardeningknowhow.com/composting/manures/chicken-manure-fertilizer.htm

Yes, wood chips that are from a kiln dried wood are safe to use right away as a mulch.