feat: Add room_id to rooms struct, update tests

[zaydaanjahangir]

Adding room_id to guest struct

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 18.24%. Comparing base (4541c6e) to head (5207827).
⚠️ Report is 1 commits behind head on main.

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

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #262   +/-   ##
=======================================
  Coverage   18.24%   18.24%           
=======================================
  Files          42       42           
  Lines        1716     1716           
=======================================
  Hits          313      313           
  Misses       1397     1397           
  Partials        6        6           

Flag	Coverage Δ
backend	18.24% <0.00%> (ø)

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Files with missing lines	Coverage Δ
backend/internal/repository/rooms.go	0.00% <0.00%> (ø)

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[Dao-Ho]

LGTM ✅