Support serialization configuration

**Description**
Currently middleware lacks proper pagination support.

**Proposed solution**
Add configurable pagination with sensible defaults.

**Priority**: Low/Medium

The issue names no files, tests, or entry points. First clarify whether the intended change is serialization configuration or middleware pagination, then locate the middleware implementation and existing configuration tests. Done should include documented defaults, configurable behavior, and tests covering pagination and serialization.

Written by the indexing model from the issue text.