perf(persistence): Move thread messages pagination to SQL

[VelikovPetar]

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Linear: FLU-487

Github Issue: #

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Description of the pull request

Back-port of #2688 to v9. Refactors MessageDao.getThreadMessagesByParentId to filter and paginate thread replies at the SQL level instead of loading the full thread into memory, and adds support for all four PaginationParams cursor variants (lessThan / lessThanOrEqual / greaterThan / greaterThanOrEqual) with a (createdAt, id) tiebreaker.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.98%. Comparing base (e19b1ce) to head (2b4b9c2).

Additional details and impacted files

@@            Coverage Diff             @@
##               v9    #2750      +/-   ##
==========================================
+ Coverage   65.96%   65.98%   +0.02%     
==========================================
  Files         425      425              
  Lines       26926    26946      +20     
==========================================
+ Hits        17761    17781      +20     
  Misses       9165     9165              

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