Is there any reference in Tolkien's works as to:
1. Elves having pointy ears?
2. Elves having darkvision?
3. Dwarves having darkvision?
4. Any race having infravision?
I think the answer to of those questions is No, but it's been some time since I read the books.
Lets see.
1: Kinda. Theres mention of hobbits having slightly pointed elvish ears. Which can be read various ways. Elves having pointed ears is a relatively recent feature from I believe the 1800s? So you will find depictions of them with non-pointed ears. So its 50-50 what they might have been inspired by in the books. If anything.
2: They had supernatural vision and I believe some, or all, had very keen vision. Also I believe they could see normally at night. Another one that can be read various ways.
3: Not that I recall. Theres a bit in one of the books where a dwarf wants to install lights to show off a cave. It is never mentioned how bright these lights are, or are not soooo, yep, also can be read different ways.
4: nope. 99.99% sure thats something from D&D.
X: Note that OD&D PC Dwarves Elves and Halflings can neither see in the dark nor see infrared. AD&D seems to be where they acquired infravision. In B only Dwarves have infravision. In BX Dwarves and Elves have it. Halflings do not. Same for BECMI. In AD&D Halflings had infravision dependant on their lineage. Same for 2e.
And some I'll add to that
5: Magic resistant Dwarves: Far as I recall no. None of the dwarves were resistant and if anything seemed rather susceptible to magic?
6: No-magic Dwarves: Seemed to be using magic weapons ok in the books? Pretty sure thats a D&D thing.
7: Magic resistant Hobbits: From the books seems not. Individuals might muster the willpower to resist but overall they succomb to magic like anyone else.