fix(db): fix batch_read_from_cache pairwise filter broken into cross product

[Sertug17]

Closes #3800

Replace the unzip + eq_any approach with into_boxed() + or_filter()
to ensure each (inbox_id, sequence_id) pair is matched individually
instead of producing a cross-product (inbox_id IN list) AND (sequence_id IN list).

Note

Fix batch_read_from_cache returning cross-product matches instead of exact pairs

The previous implementation filtered by inbox_id IN (...) AND sequence_id IN (...) separately, causing a cross-product of all input inbox IDs and sequence IDs to be returned instead of only the exact (inbox_id, sequence_id) pairs requested.

The fix in association_state.rs replaces the two-vector approach with iterative or_filter calls, each matching one exact (inbox_id, sequence_id) pair using a boxed query.

^{Macroscope summarized 8e1128c.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.49%. Comparing base (7a0f50f) to head (8e1128c).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3802      +/-   ##
==========================================
- Coverage   84.54%   84.49%   -0.05%     
==========================================
  Files         410      410              
  Lines       60716    60718       +2     
==========================================
- Hits        51331    51305      -26     
- Misses       9385     9413      +28     

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[insipx]

thanks!