Motivation

Chained predicate composition currently builds nested AND/OR predicate trees internally.
Even if the rendered output is the same, deep nesting makes the structure harder to reason about and maintain.

Changes

• Flatten AND/OR predicate composition by merging parts during Predicate#and / Predicate#or composition.
• Change AndPredicate / OrPredicate records to hold List<Predicate> parts and normalize nested predicates via compact constructors.
• Keep nest() behavior unchanged.

Tests

• Added regression tests for chained AND/OR rendering to keep the rendered output stable.

Notes

There is an existing comment in Predicate#and suggesting the current structuring is not ideal.
This change addresses that concern while preserving the rendered output (covered by tests).

Checklist

• You have read the Spring Data contribution guidelines.
• You used the provided code formatters and did not submit formatting-only changes.
• You submitted test cases (unit or integration tests) that back your changes.
• You added yourself as author in the headers of the classes you touched.