feat: add api subject recs

[everpcpc]

喜欢 xxx 的会员大概会喜欢

[trim21]

这表大概也没权限

[codecov]

Codecov Report

Attention: Patch coverage is 86.58537% with 11 lines in your changes missing coverage. Please review.

Project coverage is 68.92%. Comparing base (3c8aa3c) to head (e55eba7).
Report is 29 commits behind head on master.

Files with missing lines	Patch %	Lines
routes/private/routes/subject.ts	83.58%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #851      +/-   ##
==========================================
- Coverage   69.14%   68.92%   -0.23%     
==========================================
  Files          98      107       +9     
  Lines       15242    16268    +1026     
  Branches      799      861      +62     
==========================================
+ Hits        10539    11212     +673     
- Misses       4694     5047     +353     
  Partials        9        9              

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[trim21]

哦不对，这表我加过数据，应该是有权限的