EX-235: Implement QueryDSL for dynamic database queries

[hptrk]

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[Copilot]

Pull request overview

This PR refactors the transaction filtering mechanism from using JPQL queries with Spring Expression Language to QueryDSL for more maintainable and type-safe dynamic query building.

Changes:

• Replaced custom JPQL findWithFilter query with QueryDSL predicates
• Introduced TransactionPredicateBuilder utility class for building dynamic query predicates
• Moved default sorting configuration from service layer to controller layer via @PageableDefault annotation

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
TransactionPredicateBuilder.java	New utility class that builds QueryDSL predicates from transaction filter criteria
TransactionRepository.java	Extended with QuerydslPredicateExecutor interface, removed custom JPQL query method
TransactionServiceImpl.java	Simplified filtering logic to use QueryDSL predicates instead of repository's custom query method
TransactionControllerImpl.java	Added default sort configuration (date descending) to @PageableDefault annotation
libs.versions.toml	Added QueryDSL 5.1.0 version definition and library declarations
build.gradle.kts	Added QueryDSL dependencies with Jakarta classifier and annotation processor configuration

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