feat: integrate with PubTator 3 API (#312)

[holtgrewe]

No description provided.

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (50129d6) 75.83% compared to head (a4edaf1) 84.05%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #347      +/-   ##
==========================================
+ Coverage   75.83%   84.05%   +8.22%     
==========================================
  Files         170       53     -117     
  Lines        6732     1587    -5145     
  Branches     1500        0    -1500     
==========================================
- Hits         5105     1334    -3771     
+ Misses       1437      253    -1184     
+ Partials      190        0     -190     

Files	Coverage Δ
backend/app/api/internal/endpoints/remote.py	62.02% <18.18%> (-7.10%)	⬇️

... and 117 files with indirect coverage changes