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If you are not seeing bugs, it is likely a lack of nutrients or a lack of water. Provide some fertilizer and increase watering to the plant. This article may also help: https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm

You can cut the roots some, but you do not need to. To correct the lean, tie a rope around the "tree" trunk and anchor it in the direction you wish the tree to go. Use a piece of garden hose over the rope where it touches the tree to protect the plant. Tighten the rope a little every few weeks to pull it back into the right angle. This will correct it without hurting the tree.

The pods are seed pods. Tthey come from the flowers being pollinated. It never hurts to prune a wisteria but the seed pods should not happen next year as there were no blossoms to pollinate this year. This article can help you with pruning: https://www.gardeningknowhow.com/ornamental/vines/wisteria/pruning-wisteria.htm

Once wisteria is established, you can cut it back significantly without harming it. Remove dead wood as well as any crowded branches and cut back the side branchesto about a foot or so from the main trunk. You may also want to go ahead and remove any suckers that may be located around the base. This article should also help: https://www.gardeningknowhow.com/ornamental/vines/wisteria/pruning-wisteria.htm

We would recommend that you put up a trellis against the wall for the wisteria to grow up. Just letting it climb up a bare wall could cause it to do damage to the wall.

I would guess that the nitrogen to phosphorus ratio is off. Even though you fertilize, without the right amount of phosphorus, it can't bloom well. Bone meal is a great way to add phosphorus. This article will also help:
https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm