I looked everywhere, where and what are those rules?
...At the top of the category when you look at it, and at the top of your post when you click New Topic. You can't even reach the textbox without scrolling past the screenful of rules. Please read them. You had to tick a checkbox saying you did before you could click Post.
And my page is similar to all others, what could I possibly infringe?
Like I said, you triggered an automated check. The idea is that staff will look at the page ASAP, but sometimes it takes time. And the exact criteria are secret so that people with bad intentions don't try to evade the checks.
I did, this morning, 5 or 6 hours ago, I got an automatic [Request received] answer. And that’s it.
Yes, that's how it works. Next time please wait for at least 24 hours.