Service Layer Overview
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The service layer contains business logic organized into four categories:

Resource Services (``ai4drpm/services/resources/``)
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Manages legal resources, documents, provisions, classifications, and analyses.

Engine Services (``ai4drpm/services/engine/``)
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AI/ML pipeline orchestration and token usage tracking.

Shared Services (``ai4drpm/services/shared/``)
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Cross-cutting services: user management, token lifecycle, and statistics.

Bulk Services (``ai4drpm/services/bulk/``)
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Handles unified bulk operations (create, execute, update, delete) across resources.