Yea interesting you haven't seen fluid but you somewhat have to be looking for it. If you remove your airbox and look down right in front of the battery tray there is a little black cap on the breather and I had fluid piled up around that area. May be worth adding some trans fluid and doing a leveling procedure to see if you were low, that's what I'm doing.
For the other stuff, are you planning on selling it soon or something? I basically have all of that myself and drive it as a mixed street car and track car. I'm about to install coils/LCA and plan to daily it. Only thing track specific is a dedicated set of tires.
Alignment may be the main one separating duties, depends on how your toe is setup today.
I run the pss10 coils and metal top mounts along with toe 0 front, toe slightly out rear (I mess with rear toe 0 to slight in to out all the time), and lots of poly bushes everywhere. The pss10 are too soft for the track and too hard on the road. There are times that I go over railroad tracks (daily) or over expansion joists and it feels and sounds as if someone just hit the front end with a sledgehammer. It was a mixed duty car and the coils are way better than the previous mss track springs or the 034 springs, but it's just too harsh for a daily, especially with an 18 month old I cart around.
The brake pads on the front are ebc reds right now after I pulled my gloc r16 after the last track day I did last year, and they need to go. They are so much worse than the oem pads. I've got a set of ferodo ds2500 for front sitting on the side as well as brake lines, rotors front and rear, rear Porterfield r4 pads, rear hatch silencer, lower control arms and other things I just don't have time to install. The track car needs some work between every event and I just broke my splitter recently so I have to cut it back and relay carbon on the edge, which means no time to work on gti.
I've also been dealing with the pcv worn out again (happens every 5k miles with mixed duty use and more boost, normal), the dsg being super jerky in specific takeoff scenarios, and coolant that needs a top up every 10k miles or so.
The laundry list gets bigger and bigger, and I keep debating if it's worth keeping. I like the car a lot and I like how tiny it is, but I can't have my kid behind me anymore because he's too big and just hits the front seat, and if behind passenger my passenger can't be more than 5'7". The constant creaking door seals are also a nuisance because this car just sits in my driveway... I can't keep it perfectly clean so the door seals gunk and creak after just a few weeks of cleaning and lubing.
My wife wants a vert, so if I can find a vert that's a manual and can fit a convertible car seat in the rear I would get rid of the gti, get that for my wife, and take her q7 as my daily/tow vehicle. It's already my tow vehicle so not a far stretch.
Keep in mind I have put 28k miles on this car in 3 years and I average 4k mi/yr on the street. It has seen a lot of track time, and there are a lot of melty bits to prove it.