The main problem is you appear to have mistaken your blow torch for a soldering iron.
Left side is from
http://gocybershopping.com/images/xeno/_gamecube_xeno_installation_en.pdf
Right is the same area from yours.
Two obvious problems
You have lifted a trace on the xenogc chip PCB and it is now flapping in the breeze.
You have shorted two pins on the atmel device.
You may also have another short on the same side as the lifted trace.
I am not sure why the trace on main GC motherboard where it says stby appears to be cut. The angle of the xenogc also looks odd. It might be OK but it might also have gone to an adjacent line on the PCB.
Going further I don't know if you lifted pads around the various quicksolder points on the xenogc board. It will have a similar effect to the lifted pad (which is to say solder but no electrical connection).
On the install guide I have here there is a resistor on the pads in the top left of the xenogc chip on the first picture. I don't know if it was dropped for a later revision of the design but it is not there in that.
Some of those joins don't look great either.
Short version. You have likely really damaged your GC such that someone with gear and skills might need to repair it, and even then I don't know how well it will take to being chipped in the future. The xenogc is likely a writeoff as well, or at least the time investment to fix it is not worth it compared to just getting a new one.