feat: comprehensive test suite for API layer

[siiddhantt]

• What kind of change does this PR introduce?
  Testing infrastructure - Adds comprehensive test suite for API layer (api/answer and api/user modules)

• Why was this change needed?
  The API layer had minimal test coverage, making it difficult to catch bugs and refactor safely. This PR establishes a solid testing foundation with industry-standard patterns (mongomock, centralized fixtures) to ensure code quality and maintainability.

• Other information:

  • Test Results: 450 tests passing (100% pass rate) in ~43 seconds
  • Coverage: api/user/base.py: 98% | api/answer routes: 77% | api/answer services: 45-73%
  • Key Improvements:
    • Migrated from custom FakeMongoCollection to mongomock
    • Centralized fixtures in tests/conftest.py and tests/api/conftest.py

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[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.21%. Comparing base (498e2b7) to head (9830306).
⚠️ Report is 91 commits behind head on main.

Files with missing lines	Patch %	Lines
application/utils.py	33.33%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2068      +/-   ##
==========================================
+ Coverage   34.67%   42.21%   +7.53%     
==========================================
  Files         131      135       +4     
  Lines        8703     9303     +600     
==========================================
+ Hits         3018     3927     +909     
+ Misses       5685     5376     -309     

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[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
oss-docsgpt	Ready	Preview	Comment	Oct 17, 2025 9:01am