Issue #3613069: Break up AiMeteringController's dashboard() and exportLogJson() into focused private methods

Jérôme Tchaniarequested to merge
issue/ai_metering-3613069:3613069-refactor-controller-complexity into 1.0.x

Extracts private helper methods from dashboard() and exportLogJson() in AiMeteringController. No behavior change: full existing test suite (kernel + functional) passes unmodified.

Closes #3613069

https://www.drupal.org/project/ai_metering/issues/3613069

Edited by Jérôme Tchania

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