Hello,
Yes they can be folded manually. I just test drove (and bought) a 2015 A7, which does not have have electric folding mirrors. I asked the sales guy if they did fold manually - he wasn't sure but tried to do so and successfully showed me that they can...they kind of roll up and back rather than just at a straight angle (hope this makes sense).
Looking forward to collecting it next week, its a white -Black Edition, S-Line 272 HP with 21" wheels.
Hope this helps
N