chore: improve tortoise-orm maintenance path

[lphuc2250gma]

Summary:

• Add or tighten focused edge-case tests or type assertions in tests/test_f.py, tests/test_q.py related to Python typing, tests, CLI ergonomics, observability; avoid docs-only changes and broad refactors.
• Keep the change narrow so it is straightforward to review.

Notes:

• I kept this scoped to the relevant implementation and tests.

[codspeed-hq]

Merging this PR will not alter performance

✅ 24 untouched benchmarks

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_{Comparing lphuc2250gma:maint/20260606045543 (ad3a7f0) with develop (c8ed5e9)}