test: add API bootstrap dependency matrix

[lan17]

Summary

• add a new cross-group bootstrap/dependency matrix suite in tests/homesec/test_api_bootstrap_matrix.py
• validate auth/DB/runtime/media dependency gating across health, config, cameras, runtime, diagnostics, clips, stats, media, and media-token routes
• assert canonical error_code envelopes on failure paths and DB probe behavior for DB-gated failures

Verification

• uv run ruff check tests/homesec/test_api_bootstrap_matrix.py
• uv run ruff format --check tests/homesec/test_api_bootstrap_matrix.py
• uv run pytest tests/homesec/test_api_bootstrap_matrix.py -q
• make typecheck

Notes

• local make check fails in this environment due existing Postgres auth issues in unrelated DB-backed suites (pre-existing), while the new matrix suite passes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.92%. Comparing base (956c6e0) to head (ab5126c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   81.91%   81.92%   +0.01%     
==========================================
  Files          93       93              
  Lines        8104     8104              
==========================================
+ Hits         6638     6639       +1     
+ Misses       1466     1465       -1     

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