Health endpoint

[righel]

Quick health check:
/health

{
  "status": "ok"
}

Full status:
/health?full=true

{
  "status": "ok",
  "checks": {
    "postgres": "ok",
    "opensearch": "ok",
    "redis": "ok",
    "modules": "ok",
    "storage": "ok",
    "workers": "ok"
  }
}

[codecov]

Codecov Report

❌ Patch coverage is 93.87755% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.13%. Comparing base (779e224) to head (17d20ff).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
api/app/routers/diagnostics.py	91.37%	5 Missing ⚠️
api/app/tests/api_tester.py	77.77%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #263      +/-   ##
==========================================
+ Coverage   74.86%   75.13%   +0.26%     
==========================================
  Files         145      145              
  Lines       10400    10532     +132     
==========================================
+ Hits         7786     7913     +127     
- Misses       2614     2619       +5     

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