refactor: change get to post for rooms filter

[eric-kitagawa]

change the filter rooms endpoint from a get to a post

tbd:

• needs to support more than just floors but can be done in later prs

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 11.23%. Comparing base (eaa77fe) to head (a433ede).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/internal/service/server.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #212       +/-   ##
===========================================
- Coverage   24.73%   11.23%   -13.51%     
===========================================
  Files          37       95       +58     
  Lines        1237     3258     +2021     
  Branches        0       24       +24     
===========================================
+ Hits          306      366       +60     
- Misses        926     2888     +1962     
+ Partials        5        4        -1     

Flag	Coverage Δ
backend	25.02% <90.00%> (+0.28%)	⬆️
mobile	84.00% <ø> (?)
web	0.71% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
backend/internal/handler/rooms.go	93.75% <100.00%> (+7.08%)	⬆️
backend/internal/service/server.go	0.00% <0.00%> (ø)

... and 58 files with indirect coverage changes

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