Add governed source freshness audit

backend/app/api/routes/datasets.py

@@ -44,6 +44,7 @@ from app.services.raster_operations_service import RasterOperationsService
 from app.services.vector_operations_service import VectorOperationsService
 from app.services.vector_feature_service import VectorFeatureService
 from app.services.dataset_service import DatasetService
+from app.services.source_freshness_service import SourceFreshnessService
 from app.services.orthophoto_acquisition_service import OrthophotoAcquisitionService
 from app.services.dhmv_acquisition_service import DhmvAcquisitionService
 from app.services.terrain_analysis_service import TerrainAnalysisService
@@ -245,6 +246,15 @@ def list_datasets(
     return envelope({"items": [item.model_dump() for item in datasets], "total": total, "limit": limit, "offset": offset})
 
 
+@router.get("/datasets/source-freshness", response_model=dict)
+def audit_dataset_source_freshness(
+    project_id: UUID,
+    db: Session = Depends(get_db),
+):
+    report = SourceFreshnessService.audit_project(db, project_id)
+    return envelope(report.model_dump())
+
+
 @router.get("/datasets/{dataset_id}", response_model=dict)
 def get_dataset(
     project_id: UUID,