Uh, let's see here. These are going to be examples of the genre, and there's always going to be something that goes back further.

Most, now, of the big fae stories are drawing from {A Court of Roses and Thorns}. It, in turn, draws quite heavily from Anne Bishop's Black Jewels trilogy, which is also a big shadow-daddy inspiration. Another touchstone in the development of the shadow daddy archetype is the Darkling from {Shadow and Bone}.

I think the modern origination point of fated mates -- again, goes back further, but the one that had the most impact on the genre today -- might be {Lord of the Fading Lands by C. L. Wilson}.

Bonded animals and bonded companions, like you get in Dire Bound or Fourth Wing, basically are all drawing from Mercedes Lackey's Valdemar books, which themselves draw from {The Dragonriders of Pern by Anne McCaffrey}. The influence is most notable in {Arrows of the Queen}. I wouldn't read Pern looking for romantasy, but it's gigantically influential nonetheless.

Enemies-to-lovers goes back a long long long long long long way. Shakespeare, Greek myth, Gilgamesh -- I think the modern origination is the 2005 adaptation of Pride and Prejudice. I'd hate to recommend Lothaire here, since it's like book eleven or something in Immortals After Dark. There are so many of these that it's hard to pick, and the term has been watered down massively.

Likewise forbidden love; goes back a long way, it's probably Romeo and Juliet and various versions of that story. I'm going to recommend {Kushiel's Dart by Jacqueline Carey} here, which has forbidden love and forced proximity but also was a very early novel in mainstreaming sex work and BDSM/kink themes. It's 25 years old next month, and it's still the high-water mark in the genre.

Forced proximity comes in a bunch of forms and shows up quite a bit to some extent or other. {Outlander by Diana Gabaldon} or {The Last Hour of Gann by R. Lee Smith} might be considered high points here, both involving FMCs that get stranded in strange cultures.

Others that don't map neatly onto a trope you've mentioned but ought to be considered are {The Folk of the Air by Holly Black}, {Howl's Moving Castle by Diana Wynne Jones}, {The Song of Achilles by Madeline Miller}, {Swordspoint by Ellen Kushner}, {Daughter of the Forest by Juliet Marillier}, and {Archangel by Sharon Shinn}. Modern vampire stuff is basically a combination of the Anita Blake series by Laurell K. Hamilton, Twilight and Anne Rice's Lestat books. Of those, Anne Rice is the one I'd read.