Add field "manual bboxes" in the Detection table

[RonanMorgan]

We need this field in order to be able to differentiate the bboxes detected by the algorithm and the bboxes manually annoted by a human

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 86.48%. Comparing base (db5a81a) to head (c38e2c2).
Report is 25 commits behind head on main.

Files with missing lines	Patch %	Lines
src/app/api/api_v1/endpoints/detections.py	87.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #374      +/-   ##
==========================================
+ Coverage   86.39%   86.48%   +0.08%     
==========================================
  Files          34       34              
  Lines         941      962      +21     
==========================================
+ Hits          813      832      +19     
- Misses        128      130       +2     

Flag	Coverage Δ
backend	86.09% <91.66%> (+0.10%)	⬆️
client	92.06% <ø> (ø)

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[frgfm]

As discussed with @MateoLostanlen , this now falls on the labelling api side, not the alert api. Feel free to reopen if I missed something 👍