[Fix] [Frontend] Generate a negative reputation proof when checking in

[Xiawpohr]

Summary

When user's reputation is negative, generate a negative reputation proof, put this proof in authorization header of check-in API.

Linked Issue

close #508

[kittybest]

The code looks good to me, just me playing in the PR still cannot get negative reputation even I was being reported successfully, so hard to check if the checkin functions.

[Xiawpohr]

The code looks good to me, just me playing in the PR still cannot get negative reputation even I was being reported successfully, so hard to check if the checkin functions.

Perhaps we should merge PR#512 first before this one.

[kittybest]

1. I do get both positive and negative reputation
2. I do trigger the daily checkin to pop up if I had negative reputation
3. I clicked on daily checked in, do have +1 to my reputation
4. I cannot do anything when I have negative reputation

however, some issues might relate to this PR, open an issue here: #516

if you think it's not related, I would approve this PR and we could deal with the issue in another PR.

[Xiawpohr]

@kittybest I think the issue #516 is not in the scope of this PR. We can deal with it in another PR.

[kittybest]

thanks!