refactor: extract base classes to reduce SDK data integration duplication

[milosdjakovic-vicert]

Summary

• Create _BaseDocumentEffect base class for shared validation logic across document effects
• Create BaseReportTemplateQuerySet base class for common filtering methods across template querysets
• Use models.Manager.from_queryset() pattern for SpecialtyReportTemplate to match other template models
• Use database codes directly in ReviewMode enum to eliminate mapping dictionary

Changes

Effects Layer:

• New _BaseDocumentEffect in canvas_sdk/effects/data_integration/base.py
• Updated 5 effect classes to inherit from base class
• Extracted validate_confidence_scores_keys and _validate_document_id_not_empty to base

Data Layer:

• New BaseReportTemplateQuerySet in canvas_sdk/v1/data/base.py
• Updated 3 template querysets to inherit common active(), inactive(), search(), custom(), builtin() methods
• Aligned SpecialtyReportTemplate manager pattern with LabReportTemplate and ImagingReportTemplate

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

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