Add probe endpoints

[keiranjprice101]

Closes #185

Description

[codecov]

Codecov Report

❌ Patch coverage is 57.14286% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.55%. Comparing base (d06873d) to head (6abb08b).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
fia_auth/routers.py	60.00%	4 Missing ⚠️
fia_auth/db.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #188      +/-   ##
==========================================
- Coverage   98.50%   97.55%   -0.95%     
==========================================
  Files          18       18              
  Lines         600      613      +13     
==========================================
+ Hits          591      598       +7     
- Misses          9       15       +6     

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